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 87
right lined figures, are fuchwhich are equiangular,(that is, whofe feveral angles are equal one to the other) j and alfo, thefides about the equal angles proportional. Thus if the figures ac and eg are equiangular,And ab : bc : : ef : fg ; Or bc : cd :: fg : gh,Then are thofe figures called fimilar… … GEOMETRY, 67 23r. THEOREM XIX. Quantities and their like multiples, have the fame ratio. That Is, the ratio of a to b, is equal to the ratio of twice A to twice bsof thrice a to thrice b} tsV. Or thus - = ~ = -1A &c. c= c x A. B 2B p CXB Dem. For the ratio of a to b, mull either be equal to the…
Navigation · Nautical astronomy · Fortification
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![An illustration from Cosmographia in qvatvor libros distribvta summo ordine, miraqve facilitate, ac breuitate ad magnam Ptolemæi mathematicam constructionem, ad vniuersamque astrologiam institutens. Francisco Barocio ... avtore. Cum præfatione eiusdem autoris, in qua perfecta quidem astrologiæ diuisio, & enarratio autorum illustrium, & voluminum ab eis conscriptorum in singulis astrologiæ partibus habetur: Joannis de Sacrobosco verò 84 errores, et alij permulti suorum expositorum, & sectatorum ostenduntur. rationibusq[uam] redarguuntur. Præcesserunt etiam quædam communia mathematica, necnon arithmetica, & geometrica principia, nonnullæq[uam] propositiones, de quibus in toto opere sæpe fit mentio: ac demum locupletissimus index eorum, quæ ipsa Cosmographia continentur .. (1585)](https://img.insideoutlibrary.com/img/200/ia-cosmographiainqv00baro-107-30.webp)
