Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 232
Fig. 99. —Chronometer Escapement. is irregular, since when it is fully wound up it exercisesgreater force than when nearly down. In order to com- … FiG. 100.—The Fusee. pensate for this the cord or chain which is wound roundthe barrel containing the spring passes round a conicalbarrel called ?i fusee (Fig. 100) : b is the barrel containingthe spring and A A the fusee. One end of the spring is 210 STARGAZING: PAST AND PRESENT. [book hi. fixed…
Astronomy · Telescopes
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