Projection Apparatus (1917)

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Bausch & Lomb Optical Company Combined Polariscope and Vertical Attachment We have designed this attachment to provide for a quick interchange from pdariscopic to other forms of projection with the convenience characteristic of all of our projection apparatus. It permits practically instantaneous interchange between polariscopic, vertical and all other forms of projection. The attachment consists of a dark chamber, A, supported on the optical bed by two standards. The top of this dark chamber is fitted with a sliding plate upon which the vertical attachment, for projecting horizontally placed trans- parencies, and the polarizer are mounted side by side. The front of the chamber is provided with a plano-convex condensing lens and a slide carrier box, D, as well as means for attaching the bellows. Within the 117