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 390
ion, know that you will operate no¬ thing: let it be Urge about the bafis, fmall at the top , equidiAamtothefirft. Let it not be a Reel Glafs, becaufe it cannot iuflain the heat of the burning , and by burn¬ ing it lofeth its brighsnefs. Let it be therefore of Glafs a finger thick: Let the Tin foil… … To make a Btirning-Glafs of many Spherical SeBions. ftellio ascribes a certain compofitionof a Burning-glafs, made of divers Spharral Se&ions : but what he writes he proves not, nor doth he underfland what he fays : whilft T was fearching for chat, I found this. Propound the diflance of com- ba…
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.
![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-77-8.webp)
