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 79
rke, doth give me the femidiameter. As if F G be the given chord of 40 gr$ I put it over in Gand L, the fines of qogr, then becaufe the halfe of 40 gr. istogr. and the complement of 20 gr. is 70 gr.I take out theparallell fine of 70 gr. and itgiveth me A B for the femidia*meter, agreable to that… … The general!ufc o/Sines and Tangents? Jj>through each divifion perpendicular to thofe femidiatneterslike unto fines; The points, where the fines dravvne throughthe one femidiamecer do meete the fines of the complementdrawne through the other Semidiameter, fhallbethe pointsthrough which the…
Astronomy · Puritans
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