Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 247
f transit is to be multiplied by thecosine of the stars declination. 224 STARGAZING : PAST AND PRESENT. [book 111. THE HELIOMETER. There are other kinds of micrometers which we mustalso briefly consider. In the heliometer ^ we get thepower of measuring distances by doubling the imagesof the objects… … riG.[]05.—A B C, Images of Jupiter supposed to be touching ; B being producedby duplication, C duplicate image on the other side of A. A B, Double Star ; A, A & B, B, the appearance when duplicate image is movedto the right; A, A & B, B, the same when movcii to the left. we can make b…
Astronomy · Telescopes
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