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brewster kaleidoscope patent fig . en Alternative positions of the reflectors in the kaleidoscope as illustrated in the patent google nl id pgcAAAAMAAJ pg PA lpg PA dq brewsterkaleidoscopepatent source bl ots GXgSUKiGDy sig QEPGMbyWPNyDJdEEkIQ hl en sa ved ahUKEwiovKoHQAhWIMBoKHazAjChDoAQgMAg onepage false David Brewster other