The watch; its construction, its merits and defects, how to choose it, and how to use it (1860)
Piaget, Henry F · New York, Printed by C. Vinten for the author · leaf 15
of the two countries differ inprice only, this manufacture would be lost to Englandas it has been to France. THE CO^STKUCTION OF WATCHES. A clock has a combination of wheels to mark thenumber of oscillations made by a pendulum. A watchis a similar combination to mark the number of vi-brations made… … The power of motion in a watch is produecd bymeans of a spiral spring, usually called the main spring,placed in a drum or barrel, whichwhen wound round a centre willfrom its elasticity cause the barrelto make as many revolutions asthere are turns made by the spring.Time is measured in a watch by…
Clocks and watches
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