American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 96
the quadrant S D into six equal parts, lay theruler at C, and to those parts in the circle,and it will cut the line A B in those points … on a wall, or plane, facing the true northpoint. This dial is useless from September22d to March 21st, while the sun is in the sixsouthern signs (to those who inhabit thenorthern hemisphere), because it can onlyshow the time from the suns rising until sixin the morning, and in the evening from…
Clocks and watches
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