Transactions of the American Philosophical Society . *»-7-. No. XXVI. Description and Use of a very simple Instrument for settingup Sim-Dials, and for many other useful Purposes. ByRobert Patterson.—Read, October 17, 1817. HAVING occasion, some time ago, to set up a sun-dial,for a friend in the country, a method of doing this occurredto me, which, from its great simplicity, as well as accuracy,and the variety of other useful purposes for which it may beemployed, I flatter myself, the Society will not think unwor-thy of their notice. Description of the Instrument made use of for the abovepurpos
Transactions of the American Philosophical Society . *»-7-. No. XXVI. Description and Use of a very simple Instrument for settingup Sim-Dials, and for many other useful Purposes. ByRobert Patterson.—Read, October 17, 1817. HAVING occasion, some time ago, to set up a sun-dial,for a friend in the country, a method of doing this occurredto me, which, from its great simplicity, as well as accuracy,and the variety of other useful purposes for which it may beemployed, I flatter myself, the Society will not think unwor-thy of their notice. Description of the Instrument made use of for the abovepurpose. This instrument, in its most simple form, consists of 1. A square prism or block of wood, about three incheslong, and l 1-2 on the side. 2. A wooden scale or index, about 8 inches long, l 1-2broad, and 1-4 thick. Along the flat sides of this scale, thereare drawn, by a carpenters gauge, three or four fine lines,parallel to the opposite edges of the scale. Near one end ofthis scale, there is inserted a brass pin or piece of wire, pro-jecting about l o
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