Etymology
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packer (n.)

mid-14c., pakker (mid-13c. as a surname), "one who packs goods in bundles for transportation," agent noun from pack (v.). As "a machine used for packing," by 1890. The Wisconsin U.S. football team was named at its founding in 1919 for the Indian Packing Company (a meat-canning operation where one of the founders worked as a shipping clerk), which gave the team organizers $500 for uniforms and equipment and let it use the company's field on condition that the team be named for its sponsor.

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juror (n.)
"one who serves on a jury," c. 1300 (late 12c. in Anglo-Latin), from Anglo-French jurour (late 13c.), Old French jureor "character witness, person who swears an oath," from Latin iuratorem (nominative iurator) "swearer, sworn census-clerk," agent noun from iurare "to swear," from ius (genitive iuris) "law" (see jurist). Meaning "one of a group selected to award prizes, etc. at a public exhibition" is from 1851; this particular use seems to have arisen with the great Industrial Exhibition held that year at the Crystal Palace in London.
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auditor (n.)
early 14c., "official who receives and examines accounts;" late 14c., "a hearer, one who listens," from Anglo-French auditour (Old French oieor "listener, court clerk," 13c.; Modern French auditeur), from Latin auditor "a hearer, a pupil, scholar, disciple," in Medieval Latin "a judge, examiner of accounts," from auditus, past participle of audire "to hear" (from PIE root *au- "to perceive"). The process of receiving and examining accounts formerly was done, and vouched for, orally. Related: Auditorial.
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embezzlement (n.)

"theft or misappropriation of funds placed in one's trust or belonging to one's employer," 1540s, from embezzle + -ment. An earlier noun was embezzling (early 15c.).

[I]n English law, a peculiar form of theft, which is distinguished from the ordinary crime in two points:— (1) It is committed by a person who is in the position of clerk or servant to the owner of the property stolen; and (2) the property when stolen is in the possession of such clerk or servant. The definition of embezzlement as a special form of theft arose out of the difficulties caused by the legal doctrine that to constitute larceny the property must be taken out of the possession of the owner. Servants and others were thus able to steal with impunity goods entrusted to them by their masters. A statute of Henry VIII. (1529) was passed to meet this case; and it enacted that it should be felony in servants to convert to their own use caskets, jewels, money, goods or chattels delivered to them by their masters. [Encyclopaedia Britannica, 1910]
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sales 

"of or pertaining to sale, sales, or the business of selling," word-forming element from genitive of sale (n.), by 1520s, in salesman. Cf. saleswork "work done for sale" (1775). For earlier use of similar formations, compare craftsman, oarsman, both Middle English. Sales tax is attested by 1886; sales clerk by 1863; sales associate by 1946. Sales representative is from 1910.

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marker (n.)

Old English mearcere "writer, notary" (glossing Latin notarius "clerk"), literally "one who marks," agent noun from mark (v.). Not found again until late 15c., hence modern use is perhaps a separate formation. Meaning "monument stone" is from 1888. Sense of "tool for marking" is by 1725; meaning "felt-tipped marker pen" is from 1951, so called because their purpose was to highlight text.

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weatherman (n.)

"one who observes the weather," 1869, from weather (n.) + man (n.). Weather-prophet is from 1784 as "barometer;" 1827 as "person who predicts the weather."

Clerk of the Weather, I deplore
That all thy greatness is no more,
As should a gentle bard;
That Nature, or that Nature's law
When you politely called for thaw,
Gave frost was rather hard.
[from "Consolatory Address to Mr. Murphy, the Weather Prophet," Colburn's New Monthly Magazine, 1838]
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receiver (n.)

mid-14c., receivour (mid-13c. as a surname, probably in the "government clerk" sense), "a recipient; a receiver (of stolen goods); person who knowingly harbors criminals," also "government official appointed to collect or receive money due," agent noun from receive, or from Old French recevere (Modern French receveur), agent noun from recievere.

From late 14c. as "receptacle, container." As a telephone apparatus, from 1877; in reference to a radio unit, from 1891; in U.S. football sense, from 1897. Middle English also has receitour in the sense "receiver of stolen goods" (late 14c.); also compare receptor.

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clearing-house (n.)

also clearinghouse, 1805, from clearing + house (n.). The original was established 1775 in London by the bankers for the adjustment of their mutual claims for checks and bills; later the word was extended to similar institutions.

CLEARING, is a method adopted by city bankers, for exchanging the drafts on each others houses, and settling the differences.—Thus at a stated hour in the afternoon, a clerk from each attends at the Clearing House, where he brings all the drafts on the other bankers, which have been paid into his house during the course of the day; and, having debited their different accounts with the articles which he has against them, he deposits them in their proper drawers, (a drawer being here allotted to each banker:) he then credits their accounts respectively, with the articles which they have against him, as found in his drawer. Balances are then struck on all the accounts, and the differences are transferred from one to another, until they are so wound up, that each clerk has only to settle with two or three others, which is done in cash, or Bank of England notes. [P. Kelly, "The Elements of Book-Keeping," London, 1805]
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Maxwell 

surname, later masc. proper name, attested from late 12c., from Maxwell, name of a town on the River Tweed on the Scottish borders (the name is probably "the well of Macc or Macca"). In physics, usually a reference to James Clerk Maxwell (1831-1879), as in Maxwell's demon (1879; as Maxwell's "intelligent demons" from 1874).

The definition of a "demon," according to the use of this word by Maxwell, is an intelligent being endowed with free will, and fine enough tactile and perceptive organisation to give him the faculty of observing and influencing individual molecules of matter. ["Nature," April 9, 1874]
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