Part 156

3. A series of things linked together; or a series of things connected and following each other in succession; as, a chain of mountains; a chain of events or ideas.

4. (Surv.) An instrument which consists of links and is used in measuring land.

&fist; One commonly in use is Gunter's chain, which consists of one hundred links, each link being seven inches and ninety-two one hundredths in length; making up the total length of rods, or sixty-six, feet; hence, a measure of that length; hence, also, a unit for land measure equal to four rods square, or one tenth of an acre.

5. pl. (Naut.) Iron links bolted to the side of a vessel to bold the dead-eyes connected with the shrouds; also, the channels.

6. (Weaving) The warp threads of a web. Knight.

Chain belt (Mach.), a belt made of a chain; -- used for transmitting power. -- Chain boat, a boat fitted up for recovering lost cables, anchors, etc. -- Chain bolt (a) (Naut.) The bolt at the lower end of the chain plate, which fastens it to the vessel's side. (b) A bolt with a chain attached for drawing it out of position. -- Chain bond. See Chain timber. -- Chain bridge, a bridge supported by chain cables; a suspension bridge. -- Chain cable, a cable made of iron links. -- Chain coral (Zo÷l.), a fossil coral of the genus Halysites, common in the middle and upper Silurian rocks. The tubular corallites are united side by side in groups, looking in an end view like links of a chain. When perfect, the calicles show twelve septa. -- Chain coupling. (a) A shackle for uniting lengths of chain, or connecting a chain with an object. (b) (Railroad) Supplementary coupling together of cars with a chain. -- Chain gang, a gang of convicts chained together. -- Chain hook (Naut.), a hook, used for dragging cables about the deck. -- Chain mail, flexible, defensive armor of hammered metal links wrought into the form of a garment. -- Chain molding (Arch.), a form of molding in imitation of a chain, used in the Normal style. - - Chain pier, a pier suspended by chain. -- Chain pipe (Naut.), an opening in the deck, lined with iron, through which the cable is passed into the lockers or tiers. -- Chain plate (Shipbuilding), one of the iron plates or bands, on a vessel's side, to which the standing rigging is fastened. -- Chain pulley, a pulley with depressions in the periphery of its wheel, or projections from it, made to fit the links of a chain. -- Chain pumps. See in the Vocabulary. -- Chain rule (Arith.), a theorem for solving numerical problems by composition of ratios, or compound proportion, by which, when several ratios of equality are given, the consequent of each being the same as the antecedent of the next, the relation between the first antecedent and the last consequent is discovered. -- Chain shot (Mil.), two cannon balls united by a shot chain, formerly used in naval warfare on account of their destructive effect on a ship's rigging. -- Chain stitch. See in the Vocabulary. -- Chain timber. (Arch.) See Bond timber, under Bond. -- Chain wales. (Naut.) Same as Channels. -- Chain wheel. See in the Vocabulary. -- Closed chain, Open chain (Chem.), terms applied to the chemical structure of compounds whose rational formulŠ are written respectively in the form of a closed ring (see Benzene nucleus, under Benzene), or in an open extended form. -- Endless chain, a chain whose ends have been united by a link.

Chain, v. t. [imp. p. p. Chained (chānd); p. pr. & vb. n. Chaining.] 1. To fasten, bind, or connect with a chain; to fasten or bind securely, as with a chain; as, to chain a bulldog.

Chained behind the hostile car. Prior.

2. To keep in slavery; to enslave.

And which more blest? who chained his country, say Or he whose virtue sighed to lose a day? Pope.

3. To unite closely and strongly.

And in this vow do chain my soul to thine. Shak.

4. (Surveying) To measure with the chain.

5. To protect by drawing a chain across, as a harbor.

Chain"less (?), a. Having no chain; not restrained or fettered. "The chainless mind." Byron.

Chain"let (?), n. A small chain. Sir W. Scott.

Chain" pump` (?). A pump consisting of an endless chain, running over a drum or wheel by which it is moved, and dipping below the water to be raised. The chain has at intervals disks or lifts which fit the tube through which the ascending part passes and carry the water to the point of discharge.

Chain" stitch` (?). 1. An ornamental stitch like the links of a chain; -- used in crocheting, sewing, and embroidery.

2. (Machine Sewing) A stitch in which the looping of the thread or threads forms a chain on the under side of the work; the loop stitch, as distinguished from the lock stitch. See Stitch.

Chain" wheel` (?). 1. A chain pulley, or sprocket wheel.

2. An inversion of the chain pump, by which it becomes a motor driven by water.

Chain"work` (?), n. Work looped or linked after the manner of a chain; chain stitch work.

Chair (?), n. [OE. chaiere, chaere, OF. chaiere, chaere, F. chaire pulpit, fr. L. cathedra chair, armchair, a teacher's or professor's chair, Gr. &?; down + &?; seat, &?; to sit, akin to E. sit. See Sit, and cf. Cathedral, chaise.]

1. A movable single seat with a back.

2. An official seat, as of a chief magistrate or a judge, but esp. that of a professor; hence, the office itself.

The chair of a philosophical school. Whewell.

A chair of philology. M. Arnold.

3. The presiding officer of an assembly; a chairman; as, to address the chair.