Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 343
t, they rub against a ring, B, or somethingelse that reduces their velocity. There is another form made by Alvan Clarke, in whicha pendulum regulates the clock, but not quite in theordinary way. The drawing will perhaps make it clear :a a, Fig. 147, is one of the wheels of the clock-traindriving a… … Fig. 147.—Bonds Spring Governor. is placed an arm, c, which is of such a length that itcatches against the studs s s, and is stopped until the CBAP. XX.] METHODS OF MOUNTING LARGE TELESCOPES. 321 pendulum, p, swings up against one of the studs, R,which moves the piece d, like a pendulum about…
Astronomy · Telescopes
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