Showing posts sorted by relevance for query Delta. Sort by date Show all posts
Showing posts sorted by relevance for query Delta. Sort by date Show all posts

Wednesday, August 31, 2022

Delta

Delta (pronounced del-tuh)

(1) The fourth letter of the Modern Greek alphabet (Δ, δ).

(2) The consonant sound represented by this letter.

(3) The fourth in a series of items.

(4) Anything triangular, an allusion to the Greek capital delta (Δ).

(5) In mathematics, an incremental change in a variable, as Δ or δ.

(6) A nearly flat plain of alluvial deposit between diverging branches of the mouth of a river, often, though not necessarily, triangular.

(7) A word used in communications to represent the letter D (usually initial capital letter); Used in the ICAO (International Civil Aviation Organization) radiotelephony spelling alphabet (usually known as the NATO phonetic alphabet).

(8) In astronomy, a star that is usually the fourth brightest of a constellation (initial capital letter).

(9) In computing, a small but noticeable effect or the set of differences between two versions of a file; in informal use, a small but noticeable effect.

(10) In surveying, the angle subtended at the centre of a circular arc.

(11) A type of cargo bike that has one wheel in front and two in back.

(12) In electrical engineering (often attributive), the closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.

(13) In finance, the rate of change in an option value with respect to the underlying asset's price.

(14) In chemistry, a value in delta notation indicating the relative abundances of isotopes or relating to or characterizing a polypeptide chain that is one of five types of heavy chains present in immunoglobins.

(15) In aerodynamics, a type of wing.

(16) The NATO code name for a class of Soviet nuclear-powered ballistic missile submarine armed with sixteen multi-warhead missiles.

(17) In physics, of or characterizing the atom or radical group that is fourth in position from the functional group of atoms in an organic molecule.

(18) In US Space Force use, a unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.

(19)   In electrical engineering, the closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.

Circa 1200: From the Middle English deltha from the Latin delta from the Ancient Greek δέλτα (délta), from the Phoenician dalet & daleth (tent door).  It was akin to the Hebrew dāleth.  It was the fourth letter of the Greek alphabet (equivalent to the Modern English D) and was shaped like a triangle (Δ).  The sense of a delta being a "triangular island or alluvial tract between the diverging branches of the mouth of a great river" is because the Ancient Greek writer Herodotus (circa 484–circa 425 BC) used it to describe the mouth of the Nile River (now known as the Nile Delta).  That was picked up in English during the 1550s and applied to other river mouths (often of quite different shapes) by 1790.  The related forms are deltaic and deltification.  In pre-modern medicine, the deltoid muscle (the large muscle of the shoulder; triangular, resembling the Greek letter delta) was described in 1758, the name from the Ancient Greek deltoeides (triangular, literally "shaped like the letter delta).  In modern use, the "deltoid muscle" gained the short-form “delts” in 1977.  The related form is deltoidal.

The delta-wing

Gloster Javelin (1951-1967).  The first twin-engined delta-wing in service, the Javelin was the UK’s long-term solution to its need for an all-weather interceptor, the post-war technology gap until then filled by the stop-gap Gloster Meteor and that most improbable cold-war fighter, the de Havilland Mosquito.  The Javelin was the last aircraft to bear the Gloster name, the company absorbed into the morass created by the mergers, acquisitions and nationalization that befell British industry between Attlee and Thatcher. 

In aviation, the delta shape pre-dated aircraft by centuries, triangular stabilizing fins for rockets described in the sixteenth and seventeenth centuries and the first lifting wing in delta form patented in 1867 for use by a dart-shaped, rocket-propelled airplane.  However, although there were prototypes and much theoretical work was done during the first half of the twentieth century, it wasn’t until the late-1940s when jet propulsion made possible high-speed subsonic and supersonic flight that it was possible to build airframes which could take advantages of the delta-wing’s unique properties.

Lockheed SR-71 Blackbird (1963-1999).  A product of Lockheed’s Skunk Works, although in development as a high-altitude interceptor since 1959, the US government didn’t admit the SR-71 existed until 1964 and decided ultimately to use it for reconnaissance and research into supersonic flight.  The SR-71 in 1976 set the world record for the fastest flight by an air-breathing manned aircraft and the mark still stands.

The delta form offers structural advantages and aerodynamic characteristics suited to the fluid dynamics of airflow in supersonic conditions.  To suit different applications, design variations have evolved, with and without additional stabilizing surfaces.  The long root chord of the delta wing and minimal structure outboard is inherently structurally efficient, able to be built stronger and stiffer yet lighter than a swept wing of equivalent lifting capability.  It’s thus simple and relatively inexpensive to build.

Avro Vulcan (1956-1984).

Until the UK adopted the submarine-launched Polaris missile system, the Vulcan was the platform for the UK’s independent nuclear deterrent and it remained in service long enough to be deployed for its only combat mission, a flight of five aircraft used for (conventional bombing) missions during the 1982 Falklands War.  Each aircraft flew almost 4000 miles  (6,500 km) from Ascension Island, Victor tankers used for the air-to-air refueling, almost 1.1 million gallons (5 million litres ) of fuel burned each mission.

The long root chord also allows a deeper structure for a given aerofoil section, providing more internal volume for fuel and other storage without a significant increase in drag although, on supersonic designs, designers often take the opportunity to use a thinner aerofoil instead, thereby further reducing drag.  Usefully, the large root chord also provides a large surface area which assists in reducing the minimum speed; a low landing speed being a design objective in most military and civil applications.  Delta wings can be designed to induce vortex lift, so flow separation can be turned into a means of increasing lift and the whole structure is naturally stable in pitch, therefore not requiring a separate tail surface.

Aérospatiale/BAC Concorde (1969-2003).

The Anglo-French supersonic passenger jet operated commercially between 1976-2003.  Flying at twice the speed of sound and carrying up to 128 passengers, it was the longest lasting of its time, the Soviet Tupolev Tu-144 in passenger service only for a few years during the 1970s after which it operated both as a freighter and a research platform and the American SST never progressed beyond engineering mock-ups.  The Americans worked out the economics were never going to make sense; the Soviets had a different relationship to money and the Concorde lasted as long as it did only because the French & British governments wrote-off the development costs.

There are drawbacks.  The large wing area creates more viscous drag for the same amount of lift compared to a high aspect ratio wing; swept wings have a better lift-to-drag ratio than deltas.  Also, high-lift devices like fowler flaps are hard to integrate into delta wings with the rearward location of the trailing edge producing intolerable pitching moments when such flaps would be deflected.  In short, delta wings are superior only in supersonic flight; their best known design probably the Anglo-French Concorde.

Lindsay Lohan in delta skirts.

A delta skirt is characterized by its triangular shape, an allusion to the Greek letter delta (Δ); almost always, a delta skirt is fitted at the waist, flaring out towards the hem, creating the triangular silhouette.  The concept is adaptable and can be made from just about any fabric, the most popular including cotton, taffeta, silk and a variety of other synthetics.  Delta skirts tend to be shorter because to produce the triangular effect as length increases either some sort of internal structure is required or additional material needs to be used, increasing bulk and weight.  Although most associated with younger women, they have been adopted by a number sub-sets from the anime aesthetic, Goths and bohemians to hippies.

Thursday, November 10, 2022

Ogee

Ogee (pronounced oh-jee)

(1) A double curve, resembling the letter S, consisting of two arcs that curve in opposite directions so that the ends are parallel.   An ogee is a kind of sigmoid curve, technically formed by the union of a concave and a convex line.

(2) In architecture, a molding with such a curve for a profile; cyma, also called gula or talon.

(3) In fluid mechanics, a specific aerodynamic profile.

(4) In mathematics, an inflection point.

(5) In cosmetic surgery, a desired shape for the curve of the malar or cheekbone prominence transitioning into the mid-cheek hollow.

(6) In distillation, the bubble-shaped chamber of a pot still connecting the swan neck to the pot which allows distillate to expand, condense and fall back into the pot.

1275-1325: From the Middle English ogeus (plural oggez), ogeve, egeve & egeove, variants by assimilation from the French oggif (diagonal rib of a vault) from the Old French œgive, ogival, ogive & augive, from the Late Latin augiva of uncertain origin.  In the Late Latin there was ogis (a support, prop), thought derived from the Classical Latin augeō (to increase, strengthen) from which Spanish gained auge (highest point of power or fortune; apogee); a doublet of ogive.  The use in architecture to describe regular & irregular S-shaped moldings began in the 1670s, supplanting the earlier augive, from the Late Latin augiva of uncertain origin but perhaps related to the Latin via (way; road).  In the Middle English, the late thirteenth century ogif was "a stone for the diagonal rib of a vault", derived from the French and the Medieval Latin ogiva.

An Ogee arch.

An ogee is a curved shape vaguely like an “S”, consisting of two arcs that curve in opposite senses, so that the ends are tangential.  In architecture, it’s used to describe a molding with a profile made by a lower concave arc flowing into a convex arc.  Used first in Persian and Greek architecture from Antiquity, it’s most familiar now as a part of the Gothic style.  Because the upper curves of the ogee arch are reversed, it’s not suitable where the load-bearing rates are high and it’s thus used mostly in self-supporting structures exposed to their own weight and not subject to high external forces.

An inflection point.

In mathematics, an ogee is an inflection point, a point on a curve at which the sign of the curvature (ie the concavity) changes; inflection points may be stationary but are neither local maxima nor local minima.  Inflection Points merely mark the point on the curve where it changes from concave upward to concave downward (or vice versa), it is not a directional measure.  Calculus is needed to find where a curve goes from concave upward to concave downward and for this mathematicians use derivatives, one which determines the slope and a second which defines whether the slope increases or decreases.

The cosmetic surgeon's template.

When cosmetic surgeons speak of the ogee curve, they’re referring to the elongated S curve which, when looking at a patient’s face at a three-quarter aspect, describes the curve from the eye through the cheek down to below the cheek (technically the malar or cheekbone prominence transitioning into the mid-cheek hollow).  As people age, the face loses volume in our face and the ogee curve flattens out. With facelifts and related procedures, the cosmetic surgeon aims to create an ogee curve, restoring the chiseled refinement of youth.

Lindsay Lohan, Cosmopolitan, October 2022 edition (photographs by Ellen Von Unwerth (b 1954)).  The photographs illustrate the ideal ogee curve in the facial structure and Ms Lohan shows how a model's pout can be used to optimize the effect.  The car is a second generation AMC Javelin (1971-1974).

Shapes derived from the ogee curve are popular design motifs used for just about everything where they can be applied but it's most associated with large, flat surfaces because it's in such spaces the geometric repetition can be most effective, thus the prevalence in fabrics, wallpaper and floor-coverings.  The mind visualizes the shape as something like a two-headed onion and it's probably the association with the architectural style so often seen on mosques or other structures in the Arab world that in there's presumed to be some Islamic influence but ogee long pre-dates Islam.  There are few conventions of use except that the designs tend to be displayed in either a horizontal or vertical aspect; diagonal deployment is rare.

In fluid mechanics, the ogee describes the shape used to create certain aerodynamic profiles, the classic example being the delta wing of the Concorde airplane.  The ogee-type wing used on the Concorde one flavor of the compound delta (sometimes called double delta or cranked arrow) where the leading edge is not straight.  Typically the inboard section has increased sweepback, creating a controlled high-lift vortex without the need for a foreplane and the shape of the sweepback is defined by the parameters of the ogee.  On the Concorde, the two sections and cropped wingtip merge into a smooth ogee curve.

Saturday, April 13, 2024

Mutual & Common

Mutual (pronounced myoo-choo-uhl)

(1) Possessed, experienced, performed, etc by each of two or more with respect to the other; reciprocal.

(2) Having the same relation each toward the other.

(3) Of or relating to each of two or more; held in common; shared.

(4) In corporate law, having or pertaining to a form of corporate organization in which there are no stockholders, and in which profits, losses, expenses etc, are shared by members in proportion to the business each transacts with the company:

(5) In informal use, an entity thus structured.

1470–1480: From the Middle English mutual (reciprocally given and received (originally of feelings)), from the Old & Middle French mutuel, from the Latin mūtu(us) (mutual, reciprocal (originally “borrowed”)), the construct being mūt(āre) (to change (source of the modern mutate (ie delta, omicron and all that))) + -uus (the adjectival suffix) + the Middle French -el (from the Latin –ālis (the third-declension two-termination suffix (neuter -āle) used to form adjectives of relationship from nouns or numerals) and rendered in English as –al.  Root was the primitive Indo-European mei- (to change, go, move).  The alternative spelling mutuall is obsolete.  Derived forms used to describe ownership structures such as quasi-mutual and trans-mutual are created as required.  Mutual & mutualist are nouns & adjectives, mutuality, mutualization, mutualism & mutualness are nouns, mutualize, mutualizing & mutualized are verbs and mutually & mutualistically are adverbs; the noun plural is mutuals.

The term "mutually exclusive" is widely used (sometimes loosely) but has a precise meaning in probability theory & formal logic where it describes multiple events or propositions such that the occurrence of any one dictates the non-occurrence of the other nominated events or propositions.  The noun mutualism is used in fields as diverse as corporate law, economic theory, materials engineering, political science and several disciplines within biology (where variously it interacts with and is distinguished from symbiosis).  The phrase "mutual admiration society" is from 1851 and appears to have been coined by Henry David Thoreau (1817–1862) to describe those who habitually were in agreement with each-other and inclined to swap praise.  The "mutual fund", although the structure pre-existed the adjectival use, is from 1950 and these soon came to be known simply as “mutuals”, the word appearing sometimes even in the registered names and the best known of the type were the building societies & benevolent (or friendly) societies, the core structural element of what was the ownership being held in common by the members rather than shareholders.  The concept of the mutual structure is of interest in some jurisdictions because of the suggestion the large assets held by chapters of the Freemasons may be so owned and, with the possibility the aging membership may ultimately result in these assets being dissolved and the proceeds distributed.  If, under local legislation, the structure was found to be mutual, membership might prove unexpectedly remunerative.

The Cold War's "mutually assured destruction" (MAD) is attested from 1963 (although it wasn’t until 1966 it entered general use) and was actually a modification of the Pentagon’s 1962 term “assured destruction” which was a technical expression from US military policy circles to refer to the number of deliverable nuclear warheads in the arsenal necessary to act as a deterrent to attack.  In the public consciousness it was understood but vaguely defined until 1965 when Robert McNamara (1916–2009; US Secretary of Defense 1961-1968) appeared before the House Armed Services Committee and explained the idea was "the minimum threat necessary to assure deterrence: the capability in a retaliatory nuclear attack to exterminate not less than one third the population of the Union of Soviet Socialist Republics (USSR)”.  The “mutual” was added as the number of deployable Soviet warheads reached a critical strategic mass.  The mastery of statistical analysis served McNamara well until the US escalation of the war in Vietnam when the Hanoi regime declined to conform to follow his carefully constructed models of behavior. 

In social media, a mutual is a pair of individuals who follow each other's social media accounts, whether by agreement or organically and there’s something a niche activity is working out the extent to which the behavior happens between bots.  Mutuality (reciprocity, interchange) was from the 1580s.  Mutually (reciprocally, in a manner of giving and receiving), was noted from the 1530s and the phrase mutually exclusive was first recorded in the 1650s.  The specialized mutualism (from the Modern French mutuellisme) dates from 1845, referring to the doctrine of French anarchist-socialist Pierre-Joseph Proudhon (1809-1865) that individual and collective well-being is attainable only by mutual dependence.  In the biological sciences, it was first used in 1876 to describe "a symbiosis in which two organisms living together mutually and permanently help and support one another" although there are those who differentiate mutualism (a type of co-existence where neither organism is directly affected by the other but the influence they exert on other organisms or the environment is of benefit to the other) from symbiosis (where there’s a co-dependency).

Parimutuel betting is from the French invention pari mutuel (mutual betting), the construct being pari (wager, from parier (to bet) from the Latin pariare (to settle a debt (literally “to make equal”)) from par, from paris (equal) + mutuel (mutual).  It describes a gambling system where all bets of a particular type are pooled and from this (gross-pool), taxes and the vigorish (from the Yiddish וויגריש‎ (vigrish), from the Russian вы́игрыш (výigryš) (winnings), the commission or “hose-take" are deducted.  The dividends are then calculated by dividing the remainder (net pool) by all winning bets.  In many jurisdictions it’s called the Tote after the totalisator, which calculates and displays bets already made; in Australia and New Zealand it’s the basis of the original agency structure of the Totalisator Agency Board (TAB).

The adoption of mutual as a synonym for "common" is from 1630s and was long condemned as being used “loosely, improperly and not infrequently, often by those who should know better”; “mutual friend" seemed the most common offence.  The view was that “mutual” could apply to only two objects and “common” should be used if three or more were involved.  Opinion has thankfully since softened.  Mutual and common (in the sense of the relation of two or more persons or things to each other) have been used synonymously since the sixteenth century and the use is considered entirely standard.  Objections are one of those attempts to enforce create rules in English which never existed, the only outcome being the choice of use treated as a class-identifier by those who care about such things and either ignored or un-noticed by most.  Tautologous use of mutual however should be avoided: One should say co-operation (not mutual co-operation) between two states.

Common (pronounced kom-uhn)

(1) Belonging equally to, or shared alike by, two or more or all in question (as in common property; common interests et al).

(2) Pertaining or belonging equally to an entire community, nation, or culture; public (as in common language; common history et al).

(3) Joint; united.

(4) Prevailing; Widespread; general; universal (eg common knowledge).

(5) Customary, habitual, everyday.

(6) In some jurisdictions a tract of land owned or used jointly by the residents of a community, usually a central square or park in a city or town (often as “the commons” or “the common”).

(7) In domestic & international law, the right or liberty, in common with other persons, to take profit from the land or waters of another, as by pasturing animals on another's land (common of pasturage ) or fishing in another's waters (common of piscary).  Of interest to economist and ecologists because of the disconnection between the economic gain from the commons and the responsibility for its care and management.

(8) Vulgar, ordinary, cheap, inferior etc (as a derogatory expression of class, often in phrases such as “common as muck” or “common as potatoes”, the back-handed compliment “the common-touch” applied to politicians best at disguising their contempt for the voters (or, as they refer to us: “the ordinary people”).

(9) In some (particularly Germanic) languages, of the gender originating from the coalescence of the masculine and feminine categories of nouns.

(10) In grammar, of or pertaining to common nouns as opposed to proper nouns.

(11) In the vernacular, referring to the name of a kind of plant or animal but its common (ie conversational) rather than scientific name (the idea reflected in the phrase “common or garden”).

(12) Profane; polluted (obsolete).

(13) Given to lewd habits; prostitute (obsolete).

(14) To communicate something; to converse, talk; to have sex; to participate; to board together; to eat at a table in common (all obsolete vernacular forms).

1250–1300: From the Middle English comun (belonging to all, owned or used jointly, general, of a public nature or character), from the Anglo-French commun, from the Old French, commun (Comun was rare in the Gallo-Romance languages, but reinforced as a Carolingian calque of the Proto-West Germanic gamainī (common) in the Old French and commun was the spelling adopted in the Modern French) (common, general, free, open, public), from the Latin commūnis (universal, in common, public, shared by all or many; general, not specific; familiar, not pretentious), thought originally to mean “sharing common duties,” akin to mūnia (duties of an office), mūnus (task, duty, gift), from the unattested base moin-, cognate with mean.  The Latin was from a reconstructed primitive Indo-European compound om-moy-ni-s  (held in common), a compound adjective, the construct being ko- (together) + moi-n- (a suffixed form of the root mei- or mey (to change, go, move (hence literally "shared by all").  The second element of the compound was the source also of the Latin munia (duties, public duties, functions; specific office).  It was possibly reinforced in the Old French by the Germanic form of om-moy-ni-s  (ko-moin-i) and influenced also the German gemein, and the Old English gemne (common, public).  Comun and its variations cam to displace the native Middle English imene & ȝemǣne (common, general, universal (from the Old English ġemǣne (common, universal)), and the later Middle English mene & mǣne (mean, common (also from the Old English ġemǣne)) and the Middle English samen & somen (in common, together (from the Old English samen (together)). A doublet of gmina.  Common is a noun, verb & adjective, commoner is a noun & adjective, commonality is a noun and commonly is an adverb; the noun plural is commons.

Common has been used disparagingly of women and criminals since at least the fourteenth century and snobs have added categories since as required.  The meanings "pertaining equally to or proceeding equally from two or more" & "not distinguished, belonging to the general mass" was from circa 1400 whereas the sense of "usual, not exceptional, of frequent occurrence" & "ordinary, not excellent" dates from the late fourteenth century.  Common prayer was that done in public in unity with other worshipers as contrasted with private prayer, both probably more common then than now.  The Church of England's Book of Common Prayer was first published in 1549 and went through several revisions for reasons both theological and political.  The 1662 edition remains the standard collection of the prayer books used in the Anglican Communion and while many churches now use versions written in more modern English, there remain traditionalists who insist on one of the early editions.

The common room was noted first in the 1660s, a place in the university college to which all members were granted common access.  The late fourteenth century common speech was used to describe both English and (less often) vernacular (which came to be called vulgar) Latin.  From the same time, the common good was an English adoption of the Latin bonum publicum (the common weal).  Common sense is from 1839 and is U whereas, because of the tortured grammar, 1848’s common-sensible is thought non-U.  The idea of common sense had been around since the fourteenth century but with a different meaning to the modern: The idea was of an internal mental power supposed to unite (reduce to a common perception) the impressions conveyed by the five physical senses (sensus communisin the Latin, koine aisthesis in the Ancient Greek). Thus it evolved into "ordinary understanding, without which one is foolish or insane" by the 1530s, formalised as "good sense" by 1726 with common-sense in the modern sense the nineteenth century expression.

The mid-fourteenth century common law was "the customary and unwritten laws of England as embodied in commentaries and old cases", as opposed to statute law.  Over the years, this did sometimes confuse people because in different contexts (common law vs statute law; common law versus equity; common law vs civil law) the connotations were different.  The phrase common-law marriage is attested from a perhaps surprisingly early 1909.  In the English legal system, common pleas was from the thirteenth century, from the Anglo-French communs plets (hearing civil actions by one subject against another as opposed to pleas of the crown).  In corporate law, common stock is attested from 1888.  The late fourteenth century commoner is from the earlier Anglo-French where in addition to conveying the expected sense of "one of the common people” also had the technical meaning “a member of the third estate of the estates-general".  In English it acquired the dual meaning as (1) of non-royal blood and (2), since the mid-fifteenth century “a member of the House of Commons.  Commonly the adverb is from circa 1300 and commonness the noun from the 1520s though it originally meant only "state or quality of being shared by more than one", the idea of something of "quality of being of ordinary occurrence" not noted until the 1590s.  The adjective uncommon assumed a similar development, in the 1540s meaning "not possessed in common" and by the 1610s meaning "not commonly occurring, unusual; rare".

Last thoughts on a non-rule

The distinction between mutual (reciprocal; between two) and common (among three or more) probably once was, at least to some extent, observed by educated writers, Dr Johnson (1709-1984) in his A Dictionary of the English Language (1755) allowing but one definition: MUTUAL a. Reciprocal; each acting in return or correspondence to the other.

G K Chesterton.

That old curmudgeon G K Chesterton (1874-1936) was certainly convinced.  Writing about Charles Dickens (1812–1870) novel Our Mutual Friend (1864-1865), he claimed the title was the source of the phrase in general speech, snobbily noting of it was the “old democratic and even uneducated Dickens who is writing here. The very title is illiterate. Any priggish pupil teacher could tell Dickens that there is no such phrase in English as 'our mutual friend'.  Anyone could tell Dickens that 'our mutual friend' means 'our reciprocal friend' and that 'our reciprocal friend' means nothing. If he had only had all the solemn advantages of academic learning (the absence of which in him was lamented by the Quarterly Review), he would have known better. He would have known that the correct phrase for a man known to two people is 'our common friend'."

The phrase in the English novel however pre-dated Dickens, Jane Austen (1775-1817) using it in both Emma (1816) and Persuasion (1818) and long before 1864, Mary Shelley (1797–1851), Sir Walter Scott (1771–1832), William Makepeace Thackeray (1811–1863), Herman Melville (1819–1891), James Fenimore Cooper (1789–1851) and Elizabeth Gaskell (1810–1865) all had “mutual friend” in their text.  Dickens, with the prominence afforded by the title and serialized in the press, doubtless popularized it and, as Chesterton well knew, literature anyway isn’t necessarily written in "common speech".  Whoever opened the floodgates, after 1864, mutual friends continued to flow, George Orwell (1903-1950), Joseph Conrad (1857–1924), Jerome K Jerome (1859–1927), Rudyard Kipling (1865–1936), Mark Twain (1835-1910), Anthony Trollope (1815-1882), Henry James (1843–1916), Robert Louis Stevenson (1850–1894), Arthur Conan Doyle (1859–1930) & Charles Kingsley (1819-1875) all content with "mutual friend" so those condemned by Chesterton are in good company.  The old snob probably did ponder if calling someone a “common friend” might create a misunderstanding but then, good with words, he’d probably avoid that by suggesting they were “rather common” or “a bit common" if that was what he wanted to convey, which not infrequently he often did.

Lindsay Lohan and her lawyer in court, Los Angeles, December 2011.

Saturday, January 7, 2023

Envelope

Envelope (pronounced on-vuh-lohp or en-vee-lope (non-U))

(1) A flat paper container, usually having a gummed flap or other means of closure and used to enclose small, flat items (especially letters) for mailing. 

(2) Something that envelops; a wrapper, integument, or surrounding cover.

(3) In biology, a surrounding or enclosing structure, as a corolla or an outer membrane.

(4) In geometry, a mathematical curve, surface, or higher-dimensional object that is the tangent to a given family of lines, curves, surfaces, or higher-dimensional objects.

(5) In the radio transmissions of a modulated carrier wave, a curve connecting the peaks of a graph of the instantaneous value of the electric or magnetic component of the carrier wave as a function of time.

(6) The fabric structure enclosing the gasbag of an aerostat or the gasbag itself.

(7) As an idiom, in pushing the envelope, to stretch established limits, as in technological advance or social innovation.

(8) In music, the shape of a sound which may be controlled by a synthesizer or sampler.

(9) In computing, the information used for routing a message that is transmitted with the message but not part of its contents, the best known example of which is the blind carbon-copy (bcc) in eMail.

(10) In astronomy, the nebulous covering of the head or nucleus of a comet; a coma.

(11) In civil engineering, an earthwork in the form of a single parapet or a small rampart, sometimes raised in the ditch and sometimes beyond it.

(12) In engineering and design, the set of limitations within which a technological system can perform safely and effectively.

(13) In aviation (of dirigibles), a bag containing the lifting gas of a balloon or airship; fabric that encloses the gas-bags of an airship.

(14) In electronics, a curve that bounds another curve or set of curves, as the modulation envelope of an amplitude-modulated carrier wave in electronics.

(15) In computing, the information used for routing a message that is transmitted with the message but not part of its contents.

(6) In music, the shape of a sound, which may be controlled by a synthesizer or sampler. 

1705: From the Middle French and Old French envoluper, the construct being en- (from the Old French en-, from the Latin in-, a prefixation of in (in, into)) + voluper (to wrap, wrap up).  In Italian, the derivation was viluppare, from the Old Italian alternate goluppare (to wrap) from the Vulgar Latin vlopp (to rap).  The Proto-Germanic wrappaną and wlappaną (to wrap, roll up, turn, wind) came from the primitive werb (to turn, bend), akin to the Middle English wlappen (to wrap, fold) and ultimately the Modern English lap (to wrap, involve, fold).  The modern wrap is derived from the Middle English wrappen (to wrap), the dialectal Danish vravle (to wind, twist), the Middle Low German wrempen (to wrinkle, distort) and the Old English wearp (warp).  The French enveloppe, is a derivative back-formation of envelopper (to envelop).  Envelope is a noun; the noun plural is envelopes.

Pushing the envelope

The phrase pushing the envelope is from the lingo of test pilots, whose job is among the most dangerous of their profession.  It entered general usage following the publication of the late Tom Wolfe’s (1930-2018) book about test pilots and the early US space program, The Right Stuff (1979).  The envelope in the phrase is a mathematical construct, what is called the "flight envelope" of a given aircraft: combinations of speed, altitude, range and stress that are considered the limits of an airframe’s capabilities and so-named because usually it's graphically represented in the shape of the familiar DL envelope.  Within the envelope formed by these parameters, the airframe is structurally sound; beyond those limits, perhaps not and that’s what test pilots do, verify the safety of the aircraft within those limits and pinpoint possible points of failure if the envelope is pushed too far.  Although big, fast computers now make the parameters of the envelope more predictable and the job of the test pilot less dangerous, structural failures during test flights continue to happen.

Lockheed F-104 Starfighter.

Few airframes have operated within such a tight envelope as the Lockheed F-104 Starfighter, introduced into service in 1956 as a single-engine, supersonic interceptor, built for the United States Air Force (USAF) but used by many nations.  Best thought of as the manned missile by which it was referred to by many, it had a radical wing design, a very small, straight, mid-mounted trapezoidal.   After the German research undertaken during World War II (1939-1945) became available, most jet fighters had used either swept or delta-wings, a compromise between speed, lift, maneuverability and internal space for fuel and equipment.  Lockheed sophisticated wind-tunnels and primitive computers however determined the optimal shape for high-speed supersonic flight was small, straight and trapezoidal.  An extraordinary achievement of manufacture as well as design, the wing was so thin and sharp it was a cut-hazard for ground crews and protective guards were fitted during maintenance.

The F-104 was the first combat aircraft capable of sustained Mach 2 flight, its speed and climb performance impressive even by today’s standards.  However, there was a price to be paid, take-off, stall and landing speeds were high as was the turn radius, combat pilots referring to low-speed turns as “banking with intent to turn".

The flight envelope, note the DL envelope shape.

The safety record was infamously bad.  Of the 916 delivered to the West-German (FRG) Air Force, 262 crashed, gaining it the nickname witwenmacher (widow maker) and some of those grieving widows sued Lockheed, receiving judgment in their favor.  In USAF service, the write-off rate was 30.63 accidents per 100,000 flight hours.  By comparison, the rate for the Convair F-102 Dagger was 14.2 and for the North American F-100 Sabre, 16.25.  The F-104's two nicknames, "manned missile" and "widow maker" may be thought of as cause and effect.

Personalised Lindsay Lohan Celebrity Birthday Card on premium quality satin cardstock @ Stg£3.95 (including envelope).

Wednesday, May 25, 2022

Eliminate, Exterminate & Eradicate

Eliminate (pronounced ih-lim-uh-neyt)

(1) To remove or get rid of, especially as being in some way undesirable.

(2) To omit, especially as being unimportant or irrelevant; leave out.

(3) To remove from further consideration or competition, especially by defeating in sport or other competitive contest.

(4) To eradicate or kill.

(5) In physiology, to void or expel from an organism.

(6) In mathematics, to remove (a quantity) from an equation by elimination.

(7) In sport, as elimination & eliminator (drag racing): category classifications. 

1560–70: From the Latin ēlīminātus (thrust out of the doors; expel), past participle of ēlīmināre, the construct being ē- (out) + līmin- (stem of līmen (threshold)) + -ātus (the Latin first/second-declension suffix (feminine -āta, neuter -ātum)).  The most commonly used form in Latin appears to have been ex limine (off the threshold).  Used literally at first, the sense of "exclude" was first attested in 1714; the now obsolete sense of "expel waste from the body" emerged circa 1795 although the general sense of an "expulsion of waste matter" is from 1855.  Eliminate is a verb, if used with an object, the verbs are eliminated & eliminating, eliminability, eliminant & eliminability are nouns and eliminable, eliminative and eliminatory are adjectives.

Exterminate (pronounced ik-stur-muh-neyt)

Totally to destroy (living things, especially pests or vermin); annihilate; extirpate.

1535–1545: From the Latin exterminātus, past participle of extermināre (to drive away (from terminus boundary)), perfect passive participle of exterminō, the construct being ex- + terminō (I finish, close, end), from terminus (limit, end).  In Late Latin there was also the sense "destroy" from the phrase ex termine (beyond the boundary), ablative of termen (boundary, limit, end).  The meaning "utterly to destroy" appeared in English only by the 1640s, a sense found earlier in equivalent words in French and in the Vulgate; earlier in this sense was the mid-fifteenth century extermine.  Exterminator actually came earlier: as early as circa 1400, the Late Latin exterminator (from past participle stem of exterminare) had the sense of "an angel who expells (people from a country) and, by 1848, as a “substance for ridding a place of rats etc) and by 1938 this was applied to a person whose job it was.  Exterminate is a verb, used with an object the verbs are exterminated & exterminating, exterminable, exterminative & exterminatory are adjectives and extermination & exterminator are nouns.

Eradicate (pronounced ih-rad-i-keyt)

(1) To remove or destroy utterly; extirpate.

(2) To erase by rubbing or by means of a chemical solvent or other agent.

(3) Of plants, to pull up by the roots.

1555–1565: From the Latin ērādīcātus (usually translated as “destroy utterly”; literally “pull up by the roots”), past participle of ērādīcāre (root out, extirpate, annihilate), the construct being ē- (out) + rādīc- (stem of rādīx (root) (genitive radicis)) + -ātus (the Latin first/second-declension suffix (feminine -āta, neuter -ātum)).  The assimilated form of ērādīcāre is derived from the primitive Indo-European wrād (branch, root) and from the same source, the native form of the same idea existed in mid-fifteenth century Middle English as outrōten (to root (something) out; eradicate).  A surprisingly recent creation in 1794 was ineradicable and within a few years, ineradicably.  Eradicate is a verb, eradicant is an adjective and noun, eradicated & eradicating are verbs (used with object), eradicable & eradicative are adjectives, eradicably is an adverb, eradication & eradicator are nouns.

Eliminate, exterminate and eradicate in the age of pandemics

In Modern English usage, eliminate, exterminate and eradicate are often used interchangeably despite differences in nuance.  This means also the wealth of synonyms the three enjoy are sometimes haphazardly used although some overlap does exist, the synonyms including: annihilate, expunge, abolish, erase, uproot, extinguish, efface, demolish, total, abate, liquidate, obliterate, trash, squash, purge, extirpate, scratch, slaughter, decimate, execute, massacre, abolish, erase, extirpate, destroy, oust, waive, ignore, defeat, cancel, exclude, disqualify, invalidate, drop, eject, expel, liquidate, omit, terminate, slay, discard & disregard.

In the (relatively) happy times before the emergence of SARS-Cov2's Delta variant, the New Zealand prime minister declared COVID-19 “eradicated but not eliminated” which did sound given that, regarding disease, the words have specific, technical meanings.  In the context of disease, eradication refers to the complete and permanent worldwide reduction to zero new cases through deliberate effort.  Elimination refers to the reduction to zero (or a very low defined target rate) of new cases in a defined geographical area, which can be any size, a province, country, continent or hemisphere.  As used by virologists and epidemiologists therefore, eradication is used in its normal conversational sense but elimination is applied with a specific technical meaning.  There is a quirk to this. The World Health Organization (WHO) certified the global eradication of smallpox in 1980 although small cultures remain in US and Russian research laboratories.  If these residual stocks are ever destroyed, the WHO may adopt some new term to distinguish between eradication in the wild and an absolute extermination from the planet.  Nobody seems now to believe COVID-19 will ever be eliminated, exterminated or eradicated.  It seems here to stay.

Defendants in the dock, International Military Tribunal (IMT, the main Nuremberg trial (1945-1946)). 

The meanings of eliminate, exterminate & eradicate, both in their English senses and in translation from German have been debated before.  Although not defined in law until the 1948 Convention on the Prevention and Punishment of the Crime of Genocide (CPPCG), the newly (1944) created word genocide appeared in the indictments served at the main Nuremberg trial (1945-1946) upon those accused under count IV, crimes against humanity.  This attracted the interest of lawyers who noted the words exterminate and eliminate appear both in the academic and legal discussions about the novel concept of genocide and in translations of many documents from the Third Reich which related to the Jews.  Defense counsel probed what was meant by these words and whether, in original or translation, their actual meaning in the context of their use was in accord with what was meant when applied to genocide.  The etymological excursion didn’t much help the defendants, most of whom were hanged.  Hermann Göring also raised an objection to a translation from the German being rendered as "final solution to the Jewish problem" rather than "total solution" which, he argued, should compel the court to draw a different inference.  In both discussions, the judges concluded what was being discussed was mass-murder and the relative degree of applicability between synonyms was not a substantive point.

Professionals in the field of pest control actually stick more closely to classic etymology in their technical distinction between the two central words: extermination and eradication.  Extermination (from the Latin, exterminare meaning “out of the boundary” and related to the deity Terminus who presided over boundaries) means to drive the pests beyond the boundaries of the building.  It doesn’t of necessity mean the pests are all dead, just that they are no longer in the building.  Eradicate (from the Latin eradicare meaning to root out) refers to the processes leading to extermination, to bring to light the breeding spots, the places where the infestation has, so to speak, taken root.