The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 66
ou proceed to draw the Dial, you mull fir ft find the three requisites mentioned in the laft Chapter, viz, 1. The height of the Pole above the Plain. 2. The dijlance of the Subfile from the Meridian. 3. The Plains difference of Longitude. Example of an Upright South Plain, declining Eaftrvard 80… … Secondly, Becaufe the Plain decline* 80 deg. Eaftwatd, let 80 deg. from N to a, and ftom H to k Thirdly
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