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 47
h from the center A, then take I outthe fecond B C, and 0 it open the Settor i\\ *B and Cy the 1 tertues a* The vfe of the lines tfLwesl termes ofthe firft line. The Setifor thus opened to his dueangle, I take out A D and A £,the parts of the firft line AB9and place them alfo on both the fides of… … required If the line A B, were longer then one of the fides of theRuler, then fhould I finde what proportion it hath to hisparts A D,*AE, and that knownc I may worke as before inthe former propofition. 9 Two numbers being giuen to finde a thirdin continual! proportion* Firft reckon the two numbers…
Astronomy · Puritans
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