Note 3 — ANNO DOMINI 2071. (continued 2)
Alexander V. W. Bikkers translation
The camera obscura (dark chamber) is a closed space impervious to light. Porta, the inventor here referred to, was a Neapolitan physician. He found that by fixing a double convex lens in the aperture, and placing a white screen in the focus, the image was much brighter and more definite.
T. ↑