International projectionist (Nov-Dec 1933)

December 1933 INTERNATIONAL PROJECTIONIST 13 plate. The sensitive operating relay and connecting panel is one complete unit mounted in a dustproof case on the back plate. All these units are readily accessible and quickly removable. Miscellaneous Features Large opening doors with heavy end braces are securely hinged to the front plate and open in a horizontal plane, permitting free access to all parts of the lamp mechanism from either the right or left side. The floor is free of all obstructions, facilitating cleaning. A compound lens system on the right-side door images the arc on a white screen at the lamphouse top, permitting the projectionist to very accurately focus the arc and at a glance observe the burning of the carbons. Arc focussing and regulating is Micrometer screw accuracy. Arc vision glasses are heat-resisting and of proper computation to eliminate harmful actinic rays. Positive and negative carbon holders are constructed to facilitate trimming and securely grip the carbons, and are made of a proper alloy to withstand high temperature. Current lead wires have contact lugs attached under press power to completely protect the small copper strands and eliminate those parts burning off. The reflector is Pyrex to withstand the heat, is of elliptical curve and proper computation to produce light on the screen of even illumination from edge The regulator-transformer used with the new Brenkert Model "K" A. C. lamp to edge. It operates at high efficiency, intercepting the greatest angle of light emitted from the arc consistent with practical considerations. The generous use of aluminum makes the lamp lightweight, without sacrificing ruggedness. Standard finish is satin black enamel, end plates with blue steel housing and nickel plated trimmings, presenting a handsome appearance in any projection room. The Brenkert compensator transformer for use with this lamp operates on any A. C. line of 95 to 130 volts, or 190 to 260 volts. An adjustment handle extending through the top plate actuates a screw which adjusts the arc input to any fractional part of amperage desired. The compensator is ruggedly built in accordance with standard electrical specifications and is well finished in satin black with nickel trimmings. There are no moving parts to wear or require oiling. Savant Sees American Labor Unions Revivified by NRA Codes Note: Professor Sumner H. Slichter's liberal views are well known to readers of International Projectionist, in which appeared his short series of articles under the general heading of "The Philosophic Background of Unions", concerning which many favorable comments were made within the craft. — Editor. TPRADE unionism will become entrenched throughout American industry as a result of the impetus given it by the NRA, Sumner H. Slichter, Professor of Business Economics at the Harvard Graduate School of Business declared recently at the twelfth annual Autumn conference of the Personnel Research Federation. Professor Slichter told the gathering of personnel directors, psychologists and employment experts that a year ago he would have "speculated on whether trade unions would survive." But in the last five months, he added, "unionism has gained more than it lost in the last thirteen years." He pointed out that during the last five or six months some 700 charters had been granted by the American Federation of Labor. Industrial Unions Wanted "Within these few months," Professor Slichter said, "the Federation reached a new peak in its membership. Most of this growth it will probably retain. How much further and how fast it will go depends on the success in working out a form of organization satisfactory to employers, some employes and existing trade unions. "There is at present a strong demand on the part of employers and the rank and file of newly organized wage earners for the industrial form of organization. This cuts across the A. F. of L. at some points. Until the resulting complications are ironed out growth in the Federation membership is likely to be retarded. "The A. F. of L. had a great opportunity to organize the working people and has thrown that opportunity away. That is an unfair statement, perhaps, but after all the A. F. of L. does not exist for organizing but rather for the preserva(Continued at foot of next page)