Transactions of the Society of Motion Picture Engineers (1916)

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REPORT OF COMMITTEE ON ELECTRICAL DEVICES MR. HARVEY M. WIBLE, Chairman MR. MAX MAYER MR. W. G. KUNZMANN MR. H. A. CAMPE INTRODUCTION 1. Advantages and disadvantages of alternating current; How ob jections may be overcome. (a) Advantages. (b) Disadvantages. 2. Advantages and disadvantages of direct current; How objec tions may be overcome. (a) Advantages. (b) Disadvantages. 3. Various methods of changing from alternating to direct cur rent when alternating current is available and direct current is desired. (a) Mercury Arc Rectifiers. (b) Motor Generator. (c) Rotary Converter. (d) Mechanical Rectifier. 4. Various apparatus for obtaining proper arc voltage when al ternating current is to be used. (a) Choke Coil or Reactance. (b) Auto Transformer. (c) Rheostat. 5. Determination of proper arc voltage for both direct current and alternating current at various currents. 6. Relation to alternating current of frequency flicker and its synchronization with the shutter. 7. Nature, size and structure of carbons required for both alter nating and direct currents for various currents. 8. Proper angle of carbons for alternating current and direct cur rent. 9. Maximum density of current at carbon points in order to ob tain maximum efficiency.