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The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 88
7 ^ Geometrical Dialling: Horizon 5 fb that if a Ruler were laid from W to E, it would cut the Meridian in Q_, for the Pole of the World, which is already the Centre of the plain, lb that the pole of the World, and the pole of the plain fall both in one point, and the pole Qjs elevated above the… … Sixthly , To draw the Hours upon this Plain, it is eafieft of all others, for if you divide the Semicircle ERW, into 1 2 equal parts in the points O © © &c. and through thole points draw ftraight lines from the Centre Q_, they (hall be the true Hour-lines belonging to this Polar Plain. And this…Dialing · Mathematical instruments · Quadrants (Astronomical instruments) · Sundials
Internet Archive · Wellcome Library · Public domain (published before 1931). Free to use for anything.
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