Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 337
justments by means of the rods E and F,so as always to send the light from the pole star into the lens,whilst the other, C, can be turned about an axis so as to reflectlight from any star on or near the meridian into the secondlens. The position of the mirror, C, is given by the graduatedcircle G.…
Astronomy
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