Johnson, Gaylord · New York, The Macmillan company · leaf 135
the boy with the opera glass. Then, when youhave looked at these next two pictures a moment,you will see how an astronomer is able to keep a bigtelescope continually pointing at the same staras long as he wants to look at it. The earthkeeps turning from West to East and the telescopekeeps turning… … FIFTH REEL 121 The next picture is a photograph of the Yerkestelescope, the largest of its kind in the world. Itkeeps pointing at any star that the astronomerwants to look at, because it turns round on a slant-ing axis that is exactly parallel to the polar axis ofthe world.
Astronomy
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