Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 438
urns uniformly once aminute : at the same time the pen-carriage is drawn slowlyalong, so that -the marks on the paper form a continuousspiral, graduated off into two-second spaces by the clockbeats. When taken off the cylinder, the paper presents theappearance of an ordinary page crossed by… … Fig. 153. —A Chronograph hy Warner & Swasey. The observer at the moment of a star-transit merely pressesa key. which he holds in his hand, and thus interpolates a markof his own among the clock beats on the sheet; as, for instance, §547] THE MERIDIAN CIRCLE. 419 at X and T in the figure. Since…
Astronomy · Constellations
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