Generator
Collier's New Encyclopedia (1921)
an apparatus for generating carbonic acid gas for charging soda-fountains, or bottles with aërated used to dewater. In chemistry, a term note the elements or compounds from which a more complex substance is obtained. Thus ethyl, alcohol, and acetic acid are the generators of acetic ether; and benzoic acid and glycocoll are the generators of hippuric acid. By the action of acids or alkalies these substances generators can be resolved into their , and, so the constitution of a con complex body can be determined; thus, Lecithin, a constituent of the brain, has the formula C4H0NR: 09; it has six generators, glycerin, phosphoric acid, stearic acid, ammonia; glycol, methyl alcohol, and therefore it is found to be a distearate of choline, and choline glycerophosphate has been found to be a trimethyl oxyethyl ammonium hydrate (CH3)3N CH OH CH OH. In distilling, a retort in which volatile hydrocarbons are distilled from liquid or solid matters. In electricity, a DYNAMO-ELECTRIC MA- CHINE (q. v.) In music, a ground note, fundamental bass, root, derivative. The principal sound or sounds by which others are produced, as the lower C for the treble of the harpsichord, which beside its octave will strike an attentive ear with its twelfth above or G in alt, and with its fifteenth above or C in alt. In steam, a vessel in which steam is generated from water, for use in a steam engine, a heating apparatus, etc. The term was first applied to the Perkins steam boiler, in which water in small quantity was heated to a high temperature . It is now specifically applied to a class of instantaneous generators. The name is now rapidly coming into use for all apparatus for generating steam , being held to be more correct than the usual term.
What Has Changed in the Last Century
Collier's in 1921 gave "generator" six parallel senses, and predicted that the word would displace "boiler" for all steam-raising plant; that never happened, and boiler remains the standard term, with "steam generator" now surviving mainly as the name for the heat exchanger that raises steam in a nuclear power station. The electrical sense, dismissed there in five words as a cross-reference to DYNAMO-ELECTRIC MACHINE, has swallowed the word: today "generator" without qualification means a machine turning mechanical work into electricity, and the direct-current dynamo it points to has itself been superseded by alternating-current alternators, including in cars. The chemical usage - alcohol and acetic acid as the "generators" of acetic ether - has vanished from the language, and the lecithin analysis offered as its showpiece is now written in modern terms as a phosphatidylcholine. Newer meanings the article could not have carried include the generator of a group in algebra and, in programming, a function that yields a sequence of values one at a time.
Written for this edition, 2026.