Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 286
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 … Fig. 127.—Side view of the carriage carrying the magnets and the pointer thatdraws the spiral. diligently pricking sidereal seconds, while we, by a con-tact-maker held in the hand, are as diligently recordingthe moments at which the star passes each wire. 264 STARGAZING : PAST AND PRESENT. [book…
Astronomy · Telescopes
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