Natural magick by John Baptista Porta, a Neapolitane : in twenty books : wherein are set forth all the riches and delights of the natural sciences (1658)
Porta, Giambattista della, approximately 1535-1615 · London : Printed for Thomas Young, and Samuel Speed ... · leaf 387
e 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 feventy two, and that makes one hundred forty and four ? thcfquare root of this is twelve; wherefore the line ere¬ cted… … fix; addethefc together , and they make four hundred uhe fquare root of it is twenty foot, thus. Wherefore I am rcfolved torake^hepart of the Glafs , intercepted between the points land F, and I feek two thirds of one foot, from C toward B, and I divide one foot into thirty parts, that the…
Magic -- Early works to 1800 · Science -- Early works to 1800 · Industrial arts -- Early works to 1800
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
