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 385
is found out by Eptclide , Ttolomy. y and Ar¬ chimedes • and I fhall add our own inventions , that the Readers may judge how far new inventions exceed the old. Fire is kindled by reflexion, retra&ion, and by a fimple and a compound Glafs. I fhall begin from a fimple reflexion, and from A… … With a Concave Pillar or Pyramidal, kindle fire : but very (lowly, with delay cnely, and in the Summer-Sun ; it kindles in the whole line, and not iD a point, but being extended by the point of accecfion of its circle* The fame will fall out by a Pyramidal Concave. Chap. XV. Of a Parabolical S eft…
Science -- Early works to 1800 · Magic · Alchemy · Industrial arts -- Early works to 1800
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