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 98
a Pyramid. So that Cones and Pyramids are folids which regularly taper from a^circle, or polygon, to a point. The circle or polygon is called the Bafe; and the point c the Vertex.. When the vertex is perpendicularly over the middle or centre of thebafe, then the folid is called a Right Cone, or a… … 279. 7s GEOMETRY; 279. A right line (ab) is perpendicular to a plane(cd) when it makes right angles (abe, abf, abg)with all the right lines (be, bf, bg) drawn in thatplane to touch the faid right line (ab). 280. So that from the fame point (b) in a plane*only one perpendicular can be drawn to that…
Navigation · Nautical astronomy · Fortification
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