International projectionist (Jan-Dec 1935)

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28 INTERNATIONAL PROJECTIONIST March 1935 POLYPHASE RECTIFIERS FOR EFFICIENT PROJECTION FOREST Copper-Oxide Rectifiers FOREST TYPE C-O RECTIFIER 60 — employs the copper-oxide units, insuring long life, quiet, trouble-free and efficient operation— all with a maintenance cost that is nil. using Westinghouse copper-oxide metal rectifying element instead of bulbs No Kill Its To Renew Forest C-O Rectifiers utilize a new principle that insures maximum efficiency, eliminates bulbs, requires no maintenance, and guarantees long life. The Forest C-O Rectifier is the ideal power supply for the Suprex arc, 40 to 65 amps. See your dealer today, or write to us for detailed information. FOREST MFG. CORP. Rectifier Specialists Belleville New Jersey ^KTIS5£ f S C REFLECTOR RECONDITIONING SERVICE INCREASE SCREEN ILLUMINATION Your reflectors can be resurfaced and resilvered at but moderate cost by our special process. . . . Pitted condensing lenses repolished. . . . Front surface mirrors resilvered. Consult Your Local Supply Dealer FISH-SCHURMAN CORPORATION 230 EAST 45th STREET NEW YORK, N. Y. each phase results in an output of direct current that is smooth and substantially without ripple, thus assuring steady, nicker less projection. The rectifier units are so mounted that the blower completely and more than adequately ventilates them by means of a continuous air stream which assures maximum cooling. The housing for the complete assembly, which is of steel, is so designed as to insure maximum cooling of both the copper-oxide units and the transformers. No heat issues from the rectifier, but only a cool breeze. Copper-oxide rectifiers are designed to serve as a power supply for the new Suprex carbon arc lamps at any desired current from 40 to 65 amperes, and 30 to 35 volts. Smaller or larger assemblies can be built to specification, of course. The outstanding features of the copper-oxide rectifier are : (1) overall efficiency comparing favorably with other means of arc current supply; (2) the absence of moving parts, except for the small fan which has been demonstrated to require absolutely no attention for a period of several years or more; (3) no maintenance costs, whether for repairs, bulbs or other replacement parts, and (4) durability and long life even under the most severe and prolonged operating conditions. The copper-oxide rectifier constitutes one of the most satisfactory sources of power supply for projection arcs — whether judged on the basis of either or both efficiency and economy. [Note: Additional information relating to the copper-oxide rectifier, or any other item of projection equipment, will be supplied upon request.] A MODERN WEAPON TO FIGHT TUBERCULOSIS (Continued from page 14) much certainty by the application of the principles which underlie the therapeutic measures in everyday practice for the treatment of tuberculosis. Basic Curative Measures Because breathing must be carried on and the blood must continuously circulate through the lung, rest to the lung can be applied only to a relative degree. Yet we can make the lung fairly safe from extensions of the disease and from the serious destruction of tissues by using the full amount of rest possible. We breathe only to oxygenate blood. We require only the amount of blood oxygenated that is vitiated by body activity. Therefore, by putting the patient at rest and stopping unnecessary body activity the least amount of blood is vitiated and the smallest amount of oxygenation is required. To show how sensitive the body response to exertion is, it is only necessary to know that if a patient sits up, as