Cold saws to Colouration.

Cold saws. (Mach.) Power machines for sawing metal with circular saws.
Cold shuts. (Fdry.) Formed in the mold when two streams of metal become so chilled before meeting that they will not fuse properly when they come togeilier.
Cold slug. (Plast.) The first material to enter an injection mold; so called, because in passing through the sprue orifice it is cooled below effective molding temperature.
Cold-s!ug well. (Plast.) Space pro­vided directly opposite the sprue opening in an injection mold to trap the cold slug.
Cold stretch. (Plast.) Pulling opera­tion usually on extruded filaments to improve tensile qualities.
Collapsing tap. (Mach.) This type of tap is used in machine tapping. The principle is similar to that of self­opening dies except that the action is reversed. Such taps permit more rapid tapping and do not mar the thread.
Collar. (Furn.) A molding extending around a leg. (Mech.) A ring formed on a shaft by forging in the solid, or by being made as a sepa­rate piece, bored and turned and held in place by a setscrew or pin. It may be shrunk on or allowed to run free.
Collar beam. (Arch.) A beam above the lower ends of the rafters and at­tached to them.
Collar oiling. (Mach.) Is used on high­speed installations. A collar which runs in a reservoir of oil in the bear­ing is either turned on the journal or is attached to it. Wipers are often used in the upper half of tne bearing to scrape oil off the collar and spread it on the journal.
Collar screw. (Shopwk.) Collar or col­lar-head screws are used for much the same purpose as regular cap screws, and in fact, are sometimes designated as "collar" or "collar­head" cap screws.
Collar stud. (Mach.) A stud threaded at one end and having a short shaft or spindle at the other, the two sepa­rated by a collar which is an integral part of the stud, used for carrying gears, levers, etc.
Collator. (Bookhndg.) One who exam­ines or checks the material to be bound into a book, for verification and correction of arrangement.
Collector. End electrode in transistor normally biased for reverse conduc­tion (hgh resistance) in relatiolJ. to base. In simple amplifying circuit, point from which output signal is taken.
Collector ring. (Elec.) A circular piece of copper against which a brush con­tacts in order to carry current from a stationary to a movable part.
Collet. (Mach.) A clamping ring or holding device; in the shops the term is freely applied to sockets for ta­pered-shank drills, and reducing sleeves and bushings of various types.

Collodion. ( Chern. ) A solution of the lower nitrate of cellulose in a mix­ture of alcohol and ether. Used for producing a film over a surface.
Colloid. (Chern.) A substance of gelatinous nature, as gelatin, starc~ albumin, etc. Also non-gelatinou 's substances, such as silver and gold, may be obtained in collodial form. Substances lying between solution and suspension are collodial dispersions. Any substance when dispersed into particles whose size ranges between 5 and 100 millimicrons. Molecules of many synthetic resins fall within this range.
Collo-type. (Print.) A photo-me­chanical, nonscreen, halftoneproc­ess which depends partly on the lithographic principle.
Colonial. (Arch. ) Relating to the style of architecture in vogue from early settlements in America up to the es­tablishment of the United States Government; although the term is frequently applied to buildings erected as late as 1840. (Furn.) That type of American furniture in vogue prior to the revolution; al­though often applied to fumiture made as late as the first half of the nineteenth century.
Colonnade. (Arch.) A row of col­ umns.
Colophon. (Print.) (l) A printers trade-mark usually placed on a ti­tle page. (2) Facts regarding the production of a book, or the name of the printer, the place and date when it was published, printed on the last page.
Colour. Anyone of the hues of the specturm, or a tint produced by the blending of these hues.
Colour filter. A coloured substance such as glass, dyed gelatin, or col­oured solution used to absrob cer­tain colours and transmit others.
Colour for tempering. In the temper­ing of steel the following colours ap­pear: white, light straw, dark straw, . blue, and purple. The tempering is checked at a certain colour accord­ing to the degree of hardness desired.
Colour form. (Print.) The second col­our in a printing job. May be run first if a key form.
Colour-harden. (Metal.) To produce a pleasing colour effect by casehardening.
Colour proofs. (Print.) Proofs of col­ our plates combined and registered.
Colour proofs-progressive. (Print.) Single proofs of each plate of a col­our set and combined proofs, show­ing result of each successive colour printed and assembled in printing sequence.
Colour scheme. A general arrange­ment or plan of colouring for a piece of work.
Colour work. (Print.) General term for colour plates to print in two or more colours.
Colouration. Alteration of sc)Und quality according to resonances or other peculiarities in an audio system. A character imparted to reproduced sound, often and mainly by loud-speakers.
Colour background generator. An

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