Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 75
ter fork. The master-fork method of maintaining the vibrations of a 6o E. A. ECKHARDT. [J. F. I. hijjjh-frequency fork has several practical disadvantages. Theadjustment of the frequency ratio to an integral number is notpermanent owing to a variety of causes, and the making of theadjustments is… … LoirTZnnm
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