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 76
arke ofSogr. Wherefore if the Radius of the circle given be equallto the laterall Radius, let the Seftor be opened neare unto hislength, fo that both the lines of Sines may make but one di-rect line* fothe diflanceon the fines betwecne to and 10,frail be a chord of zo, the diftance betweene 20 and… … ^> 66 Jr 40 ^o 6b J)& As the diamiter F H unto the Radius A H, fo the chordB E unto the fineD E, or the chord G L unto the fine A L,and then if the Radius A H, be put for the diameter, whichis a chord ofiSogr,che fine DE or AL, ihillferue for achord of 80 gr, and the femiradius which is the…
Astronomy · Puritans
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