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Keywords: 1819 brewster - treatise on the kaleidoscope fig 39-40 (kircher - bradley comparison).jpg en A comparison of the mirror constructions of Kircher left and Bradley right 1819 https //books google nl/books id 76xjAAAAcAAJ pg PA177 v onepage q f false David Brewster Athanasius Kircher Mr Bradley other versions PD-old-70-1923 Kaleidoscopes |