Hood, Grant · Kansas City, Mo. : Kansas City Jeweler and Optician · leaf 102
as the balance turns in one.direction, so we will take one-half of the number of vibia-tions we found the watch to have, for example, we have afast train, 18,000 vibrations an hour or 300 per minute. Wetake one-half of 300, which is 150, the single vibration forone minute. We count the spring for… … Fig. 4. and a weaker one selected. After two or three trials, oneshould be able to find a spring of the proper strength. Itwill be readily seen that by this method the first time aspring is vibrated, it will be known whether it will do ornot, and another can be quickly tried and counted. A word…
Clocks and watches
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