The description and use of the sector, crosse-staffe, and other instruments : with a canon of artificiall Sines and Tangents, and the use thereof in astronomie, navigation, dialling and fortification .. (1636)
Gunter, Edmund, 1581-1626 · London : Printed by William Iones for Iames Bowler · leaf 35
/the Sett or* LEt A B, A C, reprefent the leggs of the Seel or: thenfeing thefe two A B, A C, are equall, and theirfections AD, A E, alfo equall, they fhall be cut proporti-onally: and if we draw the lines EC,DE,they will beparallell by the fecond Pro. 6 lib. of Euclid, and fo theTriangles A B C. A… … The fide A D, flialbc to the fide A B, as the bafis D E,vnto the parallell baiis BC,andby conuerfion AB, (hallbe vnto A D, as B C, vntoD E: and by pern utation AD, (hall be vnto D E, as A B, to B C. &c. So that if A D, be The ground of the Settorl i 5 be the fourth part of the fide A B, then D…
Astronomy · Puritans
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