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 121
1 3d. From a, draw ac, making with ab an angle of 47*. 55j andmeeting bc in the point c. Then is the triangle abc fuch whofe parts correfpond with the thingsgiven ; and the fides ca, cb, being applied to the fcale that ab was Itaken from, their meafures will be found, viz. AC=29i j and bc=2i6, \ … For the numeral Solution, or Computation. Since two angles are known 5 Therefore From 900. oo—L. b Take 47 55_=AA Remains 42 05 =Z_ c Now in this triangle, there are known all the angles and one fide; there-fore among the known things, there is a fide and its oppofite angle jwhich belongs to the…
Navigation · Nautical astronomy · Fortification
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![An illustration from Divina proportione : opera a tutti glingegni perspicaci e curiosi necessaria oue ciascun studioso di philosophia: prospettiua pictura sculptura: architectura: musica: e altre mathematice: suavissima: sotile: e admirabile doctrina consequira: e delecterassi: co[n] varie questione de secretissima scientia (1509)](https://img.insideoutlibrary.com/img/200/ia-divinaproportion00paci-84-118.webp)