Image: 1819 brewster - treatise on the kaleidoscope fig 18-20
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Description: Polyangular Kaleidoscope of R.B. Bate (with adjustable reflector angles), as illustrated in Treatise on the Kaleidoscope (1819)
Title: 1819 brewster - treatise on the kaleidoscope fig 18-20
Credit: https://books.google.nl/books?id=76xjAAAAcAAJ&pg=PA177#v=onepage&q&f=false
Author: David Brewster
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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