Sharpless, Isaac, 1848-1920, Philips, G. M. (George Morris), 1851-1920, joint author · Philadelphia, J.B. Lippincott company · leaf 228
f the third. On a moonlessnight, with a clear atmosphere, there are three littlestars of the sixth magnitude which may be seen nearthe star at the end of the handle of the dipper, and inthe direction of the pole-star. Star Maps and Stellar Photography.—It is necessary THE CONSTELLATIONS. 223 for… … Fig. 54.—Part of the Constellation Cygnus, as seen with a Telescope. maps is by photography. The telescope is pointed toa portion of the heavens, and the image is allowed tofall on a photographic plate instead of the eye. Everystar leaves its impression in just the right relative po- 224 ASTRONOMY.…
Astronomy
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