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 99
ch the faid right line (ab). 280. So that from the fame point (b) in a plane*only one perpendicular can be drawn to that plane,on the fame fide. 281. A plane (ab) is perpendicular to a plane (cd),when the right lines (ef, gh) drawn in one plane(ab) atright angles to (fb), the common feclion of…
Navigation · Nautical astronomy · Fortification
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