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4. Notice of an Expeditious Method (believed to be new) for Computing the Time of Descent in a Circular Arc

Published online by Cambridge University Press:  16 March 2015

Edward Sang Esq.
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Extract

In determining the intensity of gravitation from the oscillations of a pendulum, and in estimating the directive power of the earth's magnetism from the frequency of vibration of a needle, we have to make allowance for the extent of the arc through which the motions take place.

The formula usually given for this purpose contains a series converging rapidly enough for very small arcs, but which requires a great amount of labour when the angle of deflection exceeds twenty or thirty degrees.

Type
Proceedings 1860-61
Information
Proceedings of the Royal Society of Edinburgh , Volume 4 , 1862 , pp. 419 - 420
Copyright
Copyright © Royal Society of Edinburgh 1862

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