Darker's Projection kaleidoscope
Darker's Projection kaleidoscope. 2 mirrors, V arrangement in brass tube, between two lens element. Separation of latter adjustable; whole focussing by sliding fit in screw flange for lantern.
More
A projection kaleidoscope resembles a lens, as it is a brass tube but consists of two long mirrors, set at 60 degree angle to each other. When light is shone down the tube, a 6 fold reflection of the projected image is produced. This example was made by Charles and Francis Darker, the sons of William Hill Darker, a 19th century London-based maker of scientific instruments.
