The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)
Robertson, J. (John), 1712-1776, Adams, Charles Francis, 1807-1886, former owner. BRL, Adams, John, 1735-1826, former owner. BRL, Boston Public Library) John Adams Library BRL · London : Printed for J. Nourse ... · leaf 149
PHERICS. SECTION III. SPHERICAL GEOMETRY. Spheric Geometry, or fpheric projection, is the art of deferibin^cr reprefenting on the plane of a great circle, fuch circles or arcs otcircles as are ufually drawn upon a fphere; and of meafuring fuch arc.and their pofitiom to one another when pro] eel ed.… … Case i. Wlien one point a is the centre of the prMmitive circle. Const. A diameter drawn thro the given poina, b, will be the great circle required. (39* Case 2. When one point a is in the circumf. of 1primitive circle. Const. Thro a draw a diameter ad.^ Then an oblique circle defcribed thro the…
Navigation · Nautical astronomy · Fortification
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
![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-24-36.webp)
