[1][2] It was an early 3-D process of making and projecting pictures, using a conventional camera lens with a concave spherical lens attached to increase field without increasing object distance.
It included a special design for the aperture plate and projection of the picture through a double convexed spherical lens of lesser focal length.
The method used 35 mm film printed single strip anaglyphic.
[3] It was used in films including the 1925 silent western The Ship of Souls.
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