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 54
ene the perpendicular of B, andhalfe hisbafe,Iiindeameane proportionall, and note it inB : this is the fide of a Square equall to B: but the propor-tion between the fquares of C and B, will be found by thefirft Prop, of Superficies to be as 5 to 4: and therefore this isthe proportion between thofe… … 3; ^ The vfe ofthelim o/Supei ftcies. other Tfyomfoides like to B, and equall to the triangle A, Firft between the perpend cular and the bafe of B, I finda meane proportionall, and note it m B3 as the fide of his e-quallfquare: then betweene the perpendicular of the tri-angle A} and halfe his bafe,…
Astronomy · Puritans
Internet Archive · Princeton University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Perspectiva; hierinnen auffs kürtzte beschrieben, mit Exempeln eröffnet vnd an Tag gegeben wird, ein newer besonder kurtzer, doch gerechter vnnd sehr leichter Weg, wie allerley Ding, es seyen Corpora, Gebew, oder was möglich zuerdencken vnd in Grund zulegen ist, verruckt oder vnuerruckt, frener in die Perspectyf gebracht werden mag, on einige vergebliche Linie, riss vñ Puncten, [et]c. dergleichen Weg bisshero noch nit bekant gewesen (1571)](https://img.insideoutlibrary.com/img/200/ia-perspectivahieri00lenc-32-20.webp)
