Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 286
Fig. 125.—Details of the travelling carriage which carries the magnets and prickers,oide view and view from above. CHAP, xvir.] THE TRANSIT CLOCK AND CHRONOGRAPH. 263 observation, which can afterwards be compared with tliemarks representing the seconds, and so the exact time ofeach observation is… … Fig. 126.—Showing how on the passage of a cuvreut round the soft iron thopricker is made to make a mark on the spiral line on the cylinder. less trouble than by the old method. Let us supposewe are making a transit observation : the clock will l^e
Astronomy · Telescopes
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