Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 284
ck on the roller every second. The observer, instead of depending upon the eyeand ear as he had to do before, has then the meansof impressing a mark at any instant upon the samecylinder, in exactly the same way that the pendulum ofthe clock impresses the mark of any second, so that aseach wire in… … Fig. 124.—Tlie Greenwich clironograph. General view. 2G2 STAKCiAZING: PAST AND PRESENT. [hook iv,
Astronomy · Telescopes
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