Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 74
amp. Precise measurements require a close time scale, that is. manytime index marks. In this way only can the errors due to unequalshrinkage of the film and non-uniform film speeds be reduced to July, IQ22.] Ax Oscillograph Camera. 59 a iiiininmnL In our work we have found one time line per… … Camera with timing system incorporated. It is well known that the difficulties of maintaining the vibra-tions of a tuning fork increase very rapidly with the frequencyof the fork. Lord Rayleigh met the situation by driving a high-frequency fork by means of a low-frequency master fork. Inthis method…
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