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 75
ts, and the femicircumference will be divided into 18 equal parts,of 10 degrees each. 3d. Thefe arcs being bifecled, will give arcs of 5 degrees. 4th. And thefe arcs being divided into 5 equal parts, by trials, willgive arcs of 1 degree each. The like may be done with the whole circumference. cth.… … A fcale of chords is ufeful for conftrucYmg an angle of a given number ofdegrees: And for finding the meafure of a given angle. *7S- PROBLEM XXII. To make an angle of a propofed number of degrees*
Navigation · Nautical astronomy · Fortification
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