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100 F. EDOUART Vol 43, No. 2
This required a light source and optical system producing the maximum efficiency, and required all the heat reducing and cooling elements we could employ, at the same time sacrificing a minimum amount of light and causing a minimum of color distortion.
The light source provided for operation of the stereopticon consists of a Mole-Richardson lamp house designed to the Academy Research Council Process Projection specifications, and has specially designed condenser elements composed of a primary system consisting of a quartz plano-convex condenser exposed to the arc, and a pyrex double-convex condenser. These in turn are focused on a circulating water-cell system consisting of 2 plano-convex condensers of optical crown glass, which in turn are focused onto a field condenser system large enough to fill the 31/* X 4-in. slide.
The combination condenser water-cell is equipped for the introduction of filters such as heat absorbing, color distortion, or neutral density, mounted in a slide that drops into a set position covering the full light ray. They may be added or removed as desired, depending upon the amperage used, whether the slide being used is of nonbreaking glass, or whether the color ratio is required to be altered. The cell uses circulating deaerated distilled water to eliminate air bubbles from forming on the inside glass surfaces during operation, and is circulated by pump through a fan-cooled radiator (Fig. 2). The capacity of the cell circulation system is approximately 2 gal per min with enclosed liquid volume totaling approximately 1/z gal.
The circulation part of the equipment is a dual system, mounted in a case on the base of the stereopticon and connected by flexible transparent plastic tubing. This mounting, in addition to the cell circulating and cooling system, also contains the circulating water and cooling system for the lamp house, as the positive carbonmounting unit in the Mole-Richardson lamp house is always kept down to hand-touch temperature, even while operating at 220 amp.
The heat-absorbing glass used in the water-cell when occasion demands is the unusually effective glass developed by Dr. Tillyer, designated as "Phosphate HeatAbsorbing Glass."
Owing to the physical characteristics of this glass, it is most essential that it be utilized in such a manner that the entire area of the screen be subjected to heat of a relatively uniform level. Because of the comparatively high coefficient of thermal expansion, coupled with a