Train
3 of the 7 encyclopedias on this shelf carry an entry for Train. Both are reproduced below, so you can see where they agree and where they differ.
American Watchmaker and Jeweler (1892)
The train of a watch or clock is the wheels and pinions through which the motive power is transmitted to the escapement. The names of the various parts in a going barrel are the barrel, which takes the place of the first or great wheel, the second wheel, which has been given the name of center wheel because it occupies a central position in the plate of the movement. Following the center wheel is the third, fourth and fifth wheels respectively, the latter one being known as the escape wheel. The pinions are known by the same name as the respective wheels which are mounted upon them. It is desirable to have the size of the train as large as possible, preserving a systematical proportion between the first and last of the train, that is one wheel should be no larger than the one immediately preceding it, the general rule being to have each succeeding wheel smaller. The center wheel makes a revolution in one hour, and it is from this that the number of vibrations are reckoned. The number of vibrations per hour may be found by multiplying together the number of teeth in the center, third and fourth wheels and multiplying this product by twice the number of teeth in the escape wheel and dividing this last product by the product of the number of leaves in the third, fourth and escape pinions. In watches showing seconds the proportion between the center and fourth wheels must be as one to sixty, because it is this pinion that carries the seconds hand. This formula for determining the vibrations applies equally well to any of the escapements, whether watch or clock. The mainspring should develop enough turns to run the timepiece at least thirty hours. The train of a watch may be tested by sharpening a piece of pegwood and with it pressing on the end of the pinion pivot into which the wheel depths, when its condition may be judged. All other things being equal, the train having the largest wheels and pinions with the greatest number of teeth and leaves, will transmit the motive power most uniformly and with the least friction. In the finest trains, the wheels should be poised, or at least very near it, this item being the more important as we approach the escapement.
Collier's New Encyclopedia (1921)
ARTHUR (CHENEY), an American author and lawyer; born in Boston, 1875. After studying law he was admitted to the bar of Massachusetts and New York. In 1901 he became assistant district attorney for New York co. In 1910 he was appointed special deputy attorney-general of the State of New York to investigate and prosecute political offenders in Queens co. Among his works are: "McAllister and His Double" (1905); "The Prisoner at the Bar" (1906); "True Stories of Crime" (1908); ; "The Goldfish" (1914); "The World and Thomas Kelly" (1917); and "The Earthquake" (1918).
The Encyclopedia of Founding (1892)
The forge-train consists of two pairs of rolls connected in one line, those on the left being the roughing or puddle rolls; the right are the finishing-rolls. The mill-train also consists of two pairs of rolls--roughing or billeting rolls, and finishing-rolls. Forge-train puddle-rolls receive the puddle-blooms from the squeezer; the mill-train billeting-rolls are for rolling merchant-iron from the puddled bar after being cut, piled, and reheated.