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 23
14 it passed in its first motion, and thus continue to vibrateuntil the friction and the resistance of the air bring itto rest. A spring thus applied is call-ed the balance or hair spring,This spring has been frequent-ly noticed as illustrating thegreat value a small piece ofsteel may acquire from…
Clocks and watches
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