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Showing papers on "Marine chronometer published in 1928"


Journal Article
TL;DR: In this article, an electrically controlled chronometer with an accuracy of one-thousandth of a second has been described, driven by a powerful phonic motor, which is controlled by a tuning-fork of adjustable frequency.
Abstract: A description is given of an electrically controlled chronometer which is capable of directly indicating time-intervals with an accuracy of one-thousandth of a second. The chronometer is driven by a powerful phonic motor, of novel design, which is controlled by a tuning-fork of adjustable frequency. Methods of eliminating and compensating errors are dealt with and accuracy tests are described. The chronometers have been used in (a) the accurate measurement of time in physical investigations, e.g. variation of period of a compound pendulum with amplitude of swing, velocity of sound in the sea, (b) sound-ranging, depth sounding, and in hydrographical survey, (c) psychological measurements - reaction times, etc., (d) motor-car speed events, (e) electrical investigations involving measurements of quantity (current × time). The instruments are robust in design and permit of simple manipulation of all parts requiring adjustment.

6 citations