The portable camera obscura (Recreation VIII)
Title: Rational Recreations, In which the Principles of Numbers and Natural Philsophy are clearly and copiously elucidated, by a series of easy, entertaining, interesting experiments
Author: William Hooper
Date: 1782
Edition: 2
Type: bookSection
Pages: 28-32
Place: London
Download: https://content.mpiwg-berlin.mpg.de/mpiwg/online/permanent/vision/pdf/Hooper_Recreation8_1782.pdf
Volume: 2