Side-lights on astronomy and kindred fields of popular science; essays and addresses (1906)
Newcomb, Simon, 1835-1909 · New York Harper · leaf 109
n mounted in thisway, an object can befollowed in its diurnalmotion from east to west by turning on the polar axisalone. But if the greatest facility in use is required,this motion must be performed by clock-work. Atelescope with this appendage will commonly costone thousand dollars and upward, so… … SECTION OF THE PRIMITIVEMOUNTINGP P. Polar axis, bearing a fork at the upper endA. Declination axis passing through the forkE. Section of telescope tubeC. Weight to balance the tube MAKING AND USING A TELESCOPE have the object-glass properly adjusted in its tube,and must use the highest power; that…
Astronomy
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