Image: 1817 brewster - kaleidoscope patent fig 4-5
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Description: Alternative positions of the reflectors in the kaleidoscope, as illustrated in the 1817 patent.
Title: 1817 brewster - kaleidoscope patent fig 4-5
Credit: https://books.google.nl/books?id=pgc1AAAAMAAJ&pg=PA321&lpg=PA321&dq=brewster+kaleidoscope+patent&source=bl&ots=GXgSUKiGDy&sig=QEP5GM9by0W1PNyDJ4dE500EkIQ&hl=en&sa=X&ved=0ahUKEwiov8K9o_HQAhWIMBoKHa1zAj84ChDoAQg2MAg#v=onepage&q&f=false
Author: David Brewster
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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