Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 555
is an exact submultiple of 180° {e.g. 30°, 45°,60°, 90°), the number of images they produce—counting for this purpose theobject as one image—is equal to the number of times the angle betweenthem is contained in 360. The kaleidoscope., invented by Sir D. Brewster, depends on thisproperty of inclined…
Physics
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