The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 107
Geometrical Dialling . 95 Firji , Draw the Circle A H R O, for your Reclining Declining Plain, and crofs it with the two Diameters A R the Vertical, and H O the Horizontal line of the Plain. Secondly, let 55 deg. the Plains Reclination from A to a, and from O to b„ … Thirdly , Lay a Ruler from H to a , and it will give you • Z the Zenith, and laid from H to h, it will give you K,the point of the Horizons interfedion with the Plains Ver¬ tical Line. So have you three points H K and O, through which to defer i be the Horizon of the place H K O. \x-F n!tr^: 'lb…
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