Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 35
Fig. 5. — How we measured the Height of the Ball. directed above the ball. If the angle on the card betoo small, then one side will be directed below the ball,while the other is pointed to the boy. The wholeaccuracy of our little observations depends upon cutting … 2% STAR-LAND. the card angles properly. When they have been trulyshaped it will be easy to find the distance of the ball.We first take a foot rule and measure the length of ourtable from one of our young friends to the other. Thatlength is twelve feet, and to discoverthe distance of the ball we…
Astronomy
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