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 162

An illustration from The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ..., 1754, leaf 162 — heric triangle abc, rightangled at a. \ If ac is greater than 90*; then z_abc is greaterthan 9©#.\ If ac is left than 90*; then Z. abc is lefs than 90*. Dem. Let the leg ac be lefs, ad equal, acgreater, than 90% and defcribe the arc db.! Now d being the pole of ab (417). ThereforeZ. DBA is right.… … S4>- SPH-ERI C S.

Navigation · Nautical astronomy · Fortification

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The elements of navigation : containing the theory and practice, with all the necessary tables, to which is added, a treatise of marine fortification ... (1754)

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