The motion picture projectionist (Nov 1930-Oct 1931)

March, 1931 Motion Picture Projectionist 43 Dismiss Canadian Action of De Forest vs. W. E. The Exchequer Court at Ottawa, Canada, dismissed on February 13 a suit of De Forest Phonofilm of Canada, Ltd., against Famous Players Canadian Corporation. The suit charged patent infringements on two De Forest patents by theatres of Famous Players Canadian Corporation, involving the use of Western Electric talking picture equipment and films recorded on Western Electric recording equipment. The action in the Exchequer Court was begun in January, 1929, after carry the camera, cameraman and director, and used to permit the camera to approach or recede from the scene being photographed. DOUBLE EXP0S17RE. Exposure of a negative film at two separate times before development. Two images will then appear combined upon the film when developed. DOUBLE MAGAZINE. A magazine for a camera through which two negatives are to run simultaneously. In such a camera each magazine must have two compartments. DOUBLE PRINTING. Exposure of a positive under two negatives, prior to its development. DOUSER. (1) Manually or (generally i electrically operated door, to cut off the light from the projection lamp from reaching the film. (2) Any door to prevent light from leaving the projection booth or other lamp-house. DOWN THE CHUTE ! Send sound into amplifier room ! DROP THE HORN". " To decrease the volume of sound from the loudspeaker. DROP THE MIKE. To lower the position of the microphone. DRUM. Huge wooden wheel on which film is spun in the drying process after development. DRUM, RECORDING. See recording drum. DRUM DEVELOPMENT, or DRUM SYSTEM. In this method of developing, films are wound spirally on cylinders which are revolved with the lower surface dipping in troughs of developer. DRUM MEMBRANE Membrane closing the inner end of the trumpet formed by the outer ear. DRUNKEN SCREW. See screw, drunken. DUBBING. Re-recording of all or part of a sound record for the preparation of a new master record, for editorial purposes, for changing volume levels or frequency characteristic or for changing the recording medium (as from film to disc, or disc to film). Dubbing may or may not involve scoring, partial or complete. DUPE. Negative made from a positive. DURALUMIN. A very hard alloy of aluminum with small amounts of copper. iron, magnesium, silicon and manganese. d v Double vibration. Same as cycle. for sound vibrations. DYNAMIC CO'NE. Type of loudspeaker in which the modulated electric current passes through a coil placed in a magnetic field. The coil and an attached paper cone vibrate and thus generate sound in accordance with the modulations of the current. DYNAMITE. An open connection box. dangerous if stepped on. into which the studio lamps are plugged. DYNAMO. Machine to convert mechanical into electrical energy. DYNAMOTOR. Type of converter (2). DYNE. Unit of force in the metric system. Approximately 450,000 dynes equal one pound of force. 68,944 dynes per square centimeter equal one pound per square inch. (To be Continued) SUPER-LITE LENSES WISELY CHOSEN BY AMERICA'S BEST THEATRES New Bifocal Super-Lite Lens An adjustable focus lens with a wide range of foci for both silent and sound film. Series IK. Super-Lite Lens Standard full Half-Size lens furnished in ?hort focus as low as 4" E. F. and up to 10" E, F. Series TV. Super-Lite Lens Full 3" diameter lens to meet the demand for more light for longer throws. 6" E. F. to 10" E. F. Quality Guaranteed PROJECTION OPTICS CO., INC. 330 Lyell Avenue ROCHESTER, N. Y. U. S. A. CARBONS COST MOiXEY 1 BEST CARBON SAVER for Low Intensity Arcs Permits projectionist to get at least one more reel from each set of stubs. Made in 7, 8, 9, 10, 12 and 13 mm. sizes. $2.50 each at your dealer. BEST DEVICES CO. 200 FILM BUILDING CLEVELAND. OHIO