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 18
e spring is regulated as nearas possible in its action; notto be too strong when fullySw^oTwork. wound, nor too weak whennearly run down. A watch without stop works, orone with imperfect ones, will be in danger of havingthe spring or some of the teeth of the barrel broken inwinding. If the spring… … 10 [f the spring to a going barrel be well made, and! thewheels so constructed that only the middle turns of thespring are required to be in action, and not those turnsof the spring in which it is at its greatest or least pow-er, the force may be sufficiently equal for ordinary pur-poses ; but…
Clocks and watches
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