Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 364
] THE EQUATORIAL OBSERVATORY. 341 the telescope, and a comfortable seat for the observer,are the two things without which a telescope is almostuseless. The observing chair is well seen in the engravingsof Mr. Newalls and the Cambridge telescopes. Theeyepieces and micrometer can be carried on the… … Fig. 155.—Section of Main Building—United States Naval Observatory, showingsupport of E(juatorial. The very high mngnifying power employed uponcquatorials in the finest states of the air necessitates avery firm foundation for the central pillar. The bestposition for such an instrument is on the…
Astronomy · Telescopes
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