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104 F. EDOUART Vol 43, No. 2
The field lens unit consists of 2 condensers, mounted with the convex spherical curves face to face with the input and output piano surfaces to the outside. The colored slide is mounted on the output side, and the unit revolves around the optical axis through 180 degrees so the slide may be leveled up for horizon line or angled either way at will.
The slide is held away from the face of the field condenser by a specially designed 4-point holder, constructed to allow for the smallest point of surface plate contact, and to allow a cooling air stream to pass between the condenser and plate, preventing heat transmission and resulting in a minimum of plate breakage.
A squirrel-cage type blower is mounted directly below the field condenser and plate holder assembly, capable of delivering 200 cu ft of air per min, the speed of which is controlled by a switch and rheostat from the main control panel. A Venturi-tube principle of adjustment with directional air baffles located directly over the blower and under the slide, provides the best possible directional adjustment for both sides of the slide simultaneously.
The objectives used are anastygmatic coated and consist of a 12-in. Astro /3.1 and 16-in. /4.5 Bausch andLomb, which are quickly interchangeable in an adjustable focusing mount. When operating at approximately 225 amp using 16-mm positive carbons, the output of this equipment is in excess of 60,000 lumens.
The main operating panel is located on the right and operating side at convenient height on which are mounted all necessary operating switches and a 2-way "talk-back" speaker connected with the camera operating table ahead of the projection screen.
The whole unit is very portable; the base is all metal, built on the dolly principle and mounted on rubber tire castors. It weighs 1800 Ib, and is equipped with convenient pan and tilt mechanisms and adjustments which lock tightly. The base has 4 screw jacks which lock the unit solidly to the floor after being placed in correct stationary shooting position (Fig. 5).
It is silent in operation for sound and is equally adaptable for both color or black-and-white stereopticon projection plates.
This whole problem of natural color stereopticons with respect to transparency process work is new and has required the most ingenious and cooperative efforts of various departments. While we do not claim perfection, we know we have achieved a reasonably satisfactory result so far, which will improve with use.