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 78
ci each otherf/n d), the oppofte angles are equal) viz. L. CDB=Z. ADE, alfo Z. CDE = Z.ADB. , E Dem. For l_ ade -\-L_ adb == two right angles. (i8r) And £_ cdb -\-/_ adb = two right angles. (181) Therefore /_ ade -f-Z_ adb =Z_ cdb -{-Z-Adb. (137) Confequently l_ ade r=Z_ CDB. (r39) 184. Corol.… … If a right line (fe) cut two parallel right lines (ab,C d) ; then is the outward angle (a) equal to the In- Cvjard and oppoftte a?rgle (d) ; and the alternate angles(V5 d) are equal: and the contrary. . TV B /,/ B Dem. Becaufe cd and ab are parallel by fuppofition:Then fe has the fame inclination…
Navigation · Nautical astronomy · Fortification
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