stereo projection in 1900

[P3D Peter Abrahams <telscope@xxxxxxxxxx>]

The book _Optical Projection_, by Russell Wright, 1911, has an end-note
dated 1906 on the lantern stereoscope.  This follows a 400 page work on
projection, the illumination of choice is a gas mixture of oxygen &
hydrogen.  The first successful stereo projection known to Wright was
exhibited at the Royal Society in 1893 by John Anderson of Birmingham.  A
pile of glass plates was the polarizer in the lantern and in the spectacles
worn by the viewer.  Anderson's innovation was to cover the screen with
silver leaf.  This gave a very bright image, but only to those seated
directly in front.  Wright's father suggested striating the screen with
vertical lines, which was successful and adopted as standard.  
T.E. Freshwater introduced anaglyphic projected slides with great success,
covering slides with colored glass.
Dr. Dupre designed a revolving shutter, fitting over each lantern, and a
synchronous shutter for each eye of the viewer, "but such a method is
necessarily too complicated and expensive to ever come into general use."
_______________________________________
Peter Abrahams   telscope@xxxxxxxxxx
the history of the telescope, the microscope,
    and the prism binocular


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