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 208
That the ferce of North and South is vigorous in the points . Blit what is more wonderful ? Though the force retreats to the middle of the ftone, yet it doth not fend it felf forth by the middle, but by the extream parts of the ftone, and lies ftill in the middle, as if ic were afleep ; but it is… … muft fay. Chap. VII. 7 hat by the touching of other fiones , thofe points will not change their forces, ANd becaufe I faid that the Load-ftone doth not always hold its forces equal, hut that one ftone is more powerful in operation then another, for fame are faint and weak;I fhall put the firft…
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.
