A chromatrope is a type of magic lantern slide that produces dazzling, colorful geometrical patterns set in motion by rotating two painted glass discs in opposite directions, originally with a double pulley mechanism but later usually with a rackwork mechanism.These 3 on auction are used , 1 has a rotating glass ring with different heads , some damage to the heads and rotating is difficult. 1 is loose in the frame .See all pictures as they are part of the description.
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