S. W. Fores, Caleidoscope-mania or, the Natives Astonished, London, 1818. Hand-colored engraving. 14 3/8" x 9 5/8". (Courtesy, Library of Congress.)
View into a 90°-90°-90°-90° kaleidoscope. Silvered and colored glass. (Photo, Gavin Ashworth.)

Sir David Brewster, designer, kaleidoscope, R. B. Bate, London, 1818–1820. Brass, steel, and glass. H. 11 13/16". (Courtesy, Science Museum, Science and Society Picture Library, London.)

Sir David Brewster, designer, Brewster’s patent kaleidoscope, extra lenses, object plates, and case, Phillip Carpenter, London, ca. 1820. Enameled brass, iron, ground glass, silver mounts, and mahogany. L. 6 5/16". (Courtesy, Science Museum, Science and Society Picture Library, London.)