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The Nuttall Encyclopedia
An optical instrument, invented by Sir David Brewster in 1817, consisting of a cylinder with two mirrors set lengthwise inside, two plates of glass with bits of coloured glass loose between at one end and an eye-hole at the other, presents varying patterns on rotation.
Wood, James, ed. Entry for 'Kaleidoscope'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/k/kaleidoscope.html. Frederick Warne & Co Ltd. London. 1900.