COSMOGRAPH PROJECTION LENS
Bausch & Lomb Optical Company, Rochester, New York 1915-1920
Primary projection lens for the Cosmograph portable 35mm motion picture projector.
The lens was manufactured by Bausch & Lomb for the Maggard-Bradley Company, which had been manufacturing motion picture machines as early as 1903. Maggard-Bradley's factory was located in Morehead, Kentucky, their name being changed to the Cosmograph Sales Company by January, 1918.
This Cosmograph lens probably dates to the 1915-1920 era.