Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 220
pendulum when vibrat-ing through not more than six degrees is practicallycycloidal, and it is only with larger arcs that the circlematerially differs from the theoretical curve required. The pendulum is kept in vibration by the escape wheel,or rather by its teeth pressing against the inclined… … Fig. 92.—The Anchor Escapemeut. the basis of our modern clocks, and, with the exceptionof the dead beat, which was due to Graham some yearsafterwards, is in almost exclusive use at the presentdate. We see that as soon as a tootli has escaped on one side,a tooth on the other begins immediately to…
Astronomy · Telescopes
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