The art of dialling : performed geometrically ... arthmetically ... instrumentally ... (1700)
Leybourn, William, 1626-1716 · London : T. Braddyll · leaf 25
(!3) Fifthly, Open the Compafles from D to 80 deg. and defer i be the Arch 80 G H, lo (hall the point H be the Chord of 80 deg. … Sixthly, Open the Compafles from D to 70, and de- Icribe the Arch 70 I K, lo is K the Chord of 70 deg. Again, . Open the Compafles from D to R, the Radius, or 60 deg. and delcribe the Arch R L B, lo is B the Chord of 60 deg. equal to the Radius. Do the like with 50,40,30,20. and 10 deg. So (hall…
![An illustration from M. Vitrvvii De architectvra libri decem : nuper maxima diligentia castigati atq[ue] excusi : additis Iulij Frontini De aqueductibus libris propter materiae affinitatem (1522)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviidearchi00vitr-178-70.webp)
![An illustration from Vnderweysung der Messung : mit dem Zirkel vn[d] Richtscheyt in Linien, Ebnen vnnd gantzen Corporen (1525)](https://img.insideoutlibrary.com/img/200/ia-vnderweysungderm00drer-91-187.webp)
