A beginner's star-book; an easy guide to the stars and to the astronomical uses of the opera-glass, the field-glass and the telescope (1912)
Murphy, Edgar Gardner, 1869-1913 · New York, London, G.P. Putnam's Sons · leaf 124
ower used reduces the field of view in which it lies, theamount of light which illuminates this field, and magnifies not the object alone but everyfactor which involves or affects it as an image. The impressions to which I have referredare, therefore: 1. The impression that the world into which you… … no H Beoinnere StarsBooU circles or areas covered by your instrument are pitifully small. The smallness of the fieldyou command makes it hard to fihd the object yoii are seeking. The field becomes smallerand this task oi finding things becomes harder with the increase of magnification. 3. The…
Astronomy
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