Collins, A. Frederick (Archie Frederick), 1869- · New York, London, D. Appleton and company · leaf 65
Fig. 46.—Tin Ring fo:: Sundial. exactly through the center of the tin ring. Now screw thebrass semi-circle to a baseboard (see Fig. 48), so that theangle made by the wire and the surface of the board will beequal to the latitude of the place where it is to be used; in otherwords, when the board is… … Fig. 47.—Brass Semi-Circle with Shadow Wire.
Astronomy · Stars
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