The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 15
ft ..v-» CO The Firft Way- Let A B be a Line given, and from the point A, which is towards the end thereof, let it be required to erect a e - … pendicular A C. ——Firft, Open your Compaffb to any final 1 diftance, and fetting one foot in the given point A, with the other defcribe the Arch FED, then fet one foot of the Compafles in D, (they being opened to the lame di¬ ftance ) croft the Arch in E, and fetting one foot in E, with the other…
