Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 223
position ; these rodsare alternately pushed outwards by the escapementbefore the pendulum in its swing arrives at them, andthen they are allowed to press against it on its returntowards the vertical, so that the pendulum has a constant 200 STARGAZING : PAST AND PRESENT. [book III. force acting on… … Fig. 94.—Gravitj Escapement (Mudge). rods hanging from the pivots Yi Yg, and on swinging itpresses against the pins at the lower ends of the rodsand so lifts the pallets Si S2 out of the teeth of theescape wheel. In the position shown the pendulum is CHAP. XIII.] THE CLOCK AND CHRONOMETER. 201…
Astronomy · Telescopes
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