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 33
z% Geometry.XXXL If a line GH erofs two parallellines AB, CD, it makes the exter*nal oppojite angles equal to eachother ; viz. GEB=CFH, andAEG=HFD. For face AB andCD are parallel to each other, theymay be confidered as one breadline, and GH crofling it; thenthe vertical or oppofite anglesGEB, CFH… … XXXII. If a line GH erofs two parallel lines AB, CD, (fee the preceding figure)the alternate angles AEF and EFD, or CFE and FEB are equal. ForGEB=AEF (art. 3oJ as alfo CFH=EFD (by the fame art. J but GEB=CFH by the laft. Therefore AEF is equal to EFD ; the fame way w&may prove FEB=CFE, XXXIII.…
Navigation · Nautical astronomy
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