Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 342
LESCOPES. 319 will give a general notion of the extreme difficultywhich any observer would have to deal with if hewanted to observe any heavenly body without a drivingclock. We can easily see at once that it would not do to havean ordinary clock regulated by a pendulum for driving thetelescope, it… … Fig. 146.—Clock Governor. form of the governor of a steam-engine, so that whenthe balls a a, Fig. 146, fly up by reason of the clockdriving too fast, they rub against a ring, B, or somethingelse that reduces their velocity. There is another form made by Alvan Clarke, in whicha pendulum regulates…
Astronomy · Telescopes
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