The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 85
Geometrical Dialling, . 75 Meridian, and W Q_€, the Horizontal Line of the Plain. Secondly , Take 55 deg. the Plains Reclination, out of your Line of Chords, and fet that diftance from N to a, and from E to b. Thirdly, Lay a Ruler from W to a, it will cut the Me¬ ridian in Z, fo is Z the Zenith of… … Fourthly , Lay a Ruler from W to b, and it will cut the Meridian in S, the South point of the Horizon, through which, and the points W and E, the Horizon of the place W S E mult be drawn. r Fifthly The Pole being diftant from the Zenith of the place 3d deg. 28 mm. equal to the Complement of the La¬…
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-149-83.webp)
