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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)

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 574

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 574
f the horizon. Hence it will be eafy to conftrucl: any of thefe cafes. Thus : Set the zen. dift. from z, to the left if fouth, but to the right if north?and this gives O the place of the fun. Set the decl. from ©, to the right if fouth, but, to the left if north?and this gives E the place of the… … JFY</.2. P JM*£

Navigation · Nautical astronomy · Fortification

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