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The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 149
nental Dialling . s 3 3 Thirdly, Lay the Trigon to your Plain, Co that the Line of Sines may lie juft upon the Hour-line of 6, and the end thereof at 90 deg. upon the point F - The Trigon lying in this pofition,with your Needle or protra&ing Pin, make marks upon your Plain, by the fide of the… … Fourthly , Lay a Ruler to F,and every one of thefe hours, halfs and quarters, and where the Ruler crofleth the iEqui- noftial Line of the Plain A B, as at the points 0 © 0, <&c. through thofe points draw right lines parallel to the Hour¬ line of 6, and they (hall be the true Hours proper for your…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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