The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 18
eo PROBL.V. A Right Line being given, how to draw another Right Line, which ffall be Parallel thereunto , at any dijlance required , or through any point affimed. DEFINITION. OF Parallel Lines, there are principally Two kinds, viz. S freight or Right Lined Parallels , and Circular Paral¬ lels. All… … line A C is the Diameter of the Greater Circle , and E G of the Leffer, the point O is the Centre of both, and all Right Lines drawn from thence to the Perifery , Circumference , or Limb of either of the Circles , are Equal, and are called fometimes the Semidia- miters , and fometimes the Radius of…
