Rackwork polarising magic lantern slide

Made:
c. 1880
maker:
Unknown

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License this image for commercial use at Science and Society Picture Library

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Science Museum Group
© The Board of Trustees of the Science Museum, London

Science Museum Group
© The Board of Trustees of the Science Museum, London

Rackwork polarising magic lantern slide with hand crank and brass rod control with rotating coloured glass polarising discs which change the image from purples to greens and vice versa.

In a rackwork slide one glass disc revolves in front of another. The moveable glass is mounted in a brass collar with a series of vertical teeth around its upper edge, forming a rackwork rim. A steel pinion with a matching toothed-end engages the rackwork and a handle is fixed to its other extremity. On turning the handle the rackwork is driven round by the pinion causing the glass to rotate.

Details

Category:
Cinematography
Object Number:
2018-434
type:
rackwork polarising magic lantern slide