Porta, Giambattista della, 1535?-1615 · London : Printed for Thomas Young, and Samuel Speed, and are to be sold at the three Pigeons, and at the Angel in St. Paul's Church-yard · leaf 387
raife a line to right Angles with A B, which fhall be the line by which, the fourth part whereof is A B : cut A B in C,and let it be two foot, and C B fixteen foot:I multiply twice fevemy two,and that makes one hundred forty and four : thefquare root of this is twelve; wherefore the line ere- &ed… … fix; addethefc together , and they make four hundred : the fquare root of it is twenty foot, thus. Wherefore I am refolvcd to rake the part of the Glafs , intercepted between the points 1 and F, and I feek two thirds of one foot, from C toward B, and I divide one foot into thirty parts, that the…
Science -- Early works to 1800 · Magic · Alchemy · Industrial arts -- Early works to 1800
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
