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 142
20. Corol. II. Hence in all circles parallel to the plane of projec-tion, their centres and poles will fall in the centre of the projection. 421. Corol. III. The centres and poles ef circles inclined to theplane of projection, fall in that diameter of the primitive circle which is Iat right angles… … tirj/j&ft,u*f <h-u{/i aaam***?/uza& 1&2 I SPHERICS. 121 423. PROP. IV. The projected diameter of any circle fubtends an angle at the eye equal tothe dijlance of that circle from its near eji pole, taken on the fphere. And thatangle is bifecled by a right line joining the eye and thai…
Navigation · Nautical astronomy · Fortification
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