The Inner Workings of a Watch - A Simple Guide for Enthusiasts of Clockwork Mechanisms
By Anon
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The Inner Workings of a Watch - A Simple Guide for Enthusiasts of Clockwork Mechanisms - Anon
THE PARTS OF A WATCH
WITH high-class watches, one can expect a very close rate of time under both extreme and normal conditions, but the inexpensive watch, by reason of its condition, cannot be expected to keep time within several seconds a day. A keen student, however, will soon be able to classify the various grades and execute work accordingly. Any new parts should be faithfully copied, if it is not possible to obtain standard material, in order to maintain the standard of the watch. Good work always reflects credit on the repairer.
Fig. 43.—A modern Swiss lever movement of the popular 10 1/2 ligne size (shown greatly enlarged).
Special Names for Parts.—The first step is to become thoroughly acquainted with the numerous components of an ordinary watch. Many parts have special names, and to be conversant with them will often save considerable time when ordering new material. The enlarged illustration on the opposite page depicts a modern Swiss Lever movement of the popular 10 1/2-ligne size.
Lignes
and sizes
are the measurements usually used to determine the size of a movement. In Fig. 44 are shown the various diameters of a movement. Of the two main dimensions that of the largest diameter is usually taken, and the most common measurement is the ligne. As 1 ligne equals approximately 3/32 in. a 10 1/2-ligne watch measures 15/16 in. which is short of an inch. The American industry favours the size
as a unit of measurement. Size O equals 1 5/30 in. Each size above size O increases by 1/30 in., and a size below O decreases by 1/30 in. 10 1/2-ligne movements are to be found in both gentlemen’s and ladies’ wrist-watches. Until a few years ago this size was almost universal in ladies’ watches, and the cheaper watches still favour this size.
Fig. 44.—The various diameters of a movement.
Fig. 45.—Three different types of screw used in the construction of a watch.
Number of Screws.—Some watches have as many as 150 separate pieces, and of this large number there are at least 35 screws. Fig. 45 shows three different types of screw: the cheese-headed plate screw, the flat-headed case screw, and the small jewel screw with countersunk head. The main frame of the movement consists of two plates: the bottom or dial plate and the top or back plate, which is visible when the case is opened. The modern back plate has changed from a circular plate into a number of sections usually called bars or bridges, thereby rendering the works easily accessible.
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