Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 65
Fig. 47.—Brass Semi-Circle with Shadow Wire. … Fig. 48.—Sundial Complete.44 THE SUN, BRIGHTEST OF THE STARS 45 the proper angle. The board should be about 12 inches squareand 1 inch thick. Since the shadow of the wire made by the sunlight will fallon XII at noon, it will be plain that the shadow of the wire fall-ing on the numbers on one side…
Astronomy · Stars
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