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 64
A c b is a right angle. 108. A Perpendicular is that right line which cutsanother at right angles; or which makes equal angles onboth fides. Thus d c is perpendicular to a b, when^the angles DC A and dcb are equal, or are right Dangles, 109- An Acute Angle (a c b) is that which is lefsE Cthan a… … B fame plane, which do not incline to one another (asC -A B, CD). G 2 112. A *4 G E O M E T R Y.
Navigation · Nautical astronomy · Fortification
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