The new American practical navigator : being an epitome of navigation, containing all the tables necessary ... (1802)
Bowditch, Nathaniel, 1773-1838, Lee, Marvin, former owner. DSI, Stuart, Gilbert, 1755-1828 DSI, Burndy Library, donor. DSI · [Salem] : Printed at Newburyport, Mass., 1802, by Edmund M. Blunt, for Cushing and Appleton, Salem : Sold by every book-seller, ship- chandler, and mathematical-instrument-maker in the United States and West Indies · leaf 57
The ufe of the Se&or depends upon the proportionability of the corref-ponding fides of fimilar triangles, demonftrated in art. 55, Geometry ; forif in the triangle ABC we take AB=ACand AD=AE, and draw DE, BC, it isevident that DE and BC will be parallel,therefore by the above-mentioned… … DESCRIPTION AND USE O-F THE SECTORp |l U/e of the Line of Lines. The line of lines is ufeful, to divide a given line into any number ofequal parts, or in any proportion, Or to find 3d and 4th proportionals, ormean proportionals, or to increafe a given line in any proportion. Example i. To divide a…
Navigation · Nautical astronomy
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