Sound ProjectionMancall Publishing Corporation, 1929 - 528 ページ |
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action adjustment alternating current ampere aperture apparatus armature auditorium binding post bulb characteristics charge charger coil condenser conductors connected CONTROL PANEL cycles device diagram diaphragm direct current effect electromotive force electrons element EQUALIZER equipment exciter lamp fader filament FILAMENT CURRENT frequency fuses grid input installation instruments light loud magnetic means metal microphones motion picture motor needle negative non-synchronous NS-A ohms operation output overtones photo electric cell pick-up pitch plate circuit plate current position POTENTIOMETER power amplifier produced projectionist projector radio RCA Photophone rectifier reproducer resistance rheostat schematic screen slit sound film sound pictures sound projection sound record sound reproduction sound track sound waves sound-on-film speaker speech speed sprocket stage storage battery supply surface switch synchronous terminals theatre tion tones transformer turntable unit vacuum tube valve vibration voice voltage voltage amplifier volts volume WESTERN ELECTRIC wire
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126 ページ - Fresh film transmits some four per cent of the light falling on it, and modulation of this light during the record is appreciated by the cell inside the sprocket. This cell is connected to a preliminary amplifier mounted below the exposure chamber, and with suitable further amplification the operator may hear from the loud speaker the record as it is actually being made on the film.
32 ページ - When overtones higher than these are eliminated the tones lose a characteristic best described by the terms "brilliance" or "definition"; they seem to lose life and become dull. The prominence of these characteristics varies with the type of instrument, the composition of the music, and the personality of the musician. The notes which are used most in music are contained in the octaves below and above middle C, or from 128 to 512 cycles...
463 ページ - I* submitted for test. 174. Sediment. — The sediment which collects underneath the plates need cause no alarm unless it deposits too rapidly, in which case there is something wrong with the way the battery is operated. In a new battery there is always a thin layer at the start. As the battery wears, the sediment becomes higher, but, for batteries which are floated, the plates usually wear out before the sediment space is filled.
90 ページ - Unit for inductance; a circuit has an inductance of 1 henry when a current changing at the rate of 1 ampere per second induces 1 volt in the circuit.
125 ページ - The light passed by the valve is then focussed with a two-to-one reduction on the photographic film at the right. A simple achromat is used to form the image of the filament at the valve plane, but a more complicated lens, designed to exacting specifications by Bausch and Lomb, is required for focussing the valve on the film. The undisturbed valve opening...
127 ページ - ... cell inside the sprocket. This cell is connected to a preliminary amplifier mounted below the exposure chamber, and with suitable further amplification the operator may hear from the loud speaker the record as it is actually being made on the film. Full modulation of the valve implies complete closing of the slit by one side of the wave of current: this modulation may not be exceeded or photographic overload will abound. Adding sound to the picture introduces no complication of studio technique...
464 ページ - ... previous month promptly. Plotting the readings saves time in reviewing and comparing. Prompt action upon indication of trouble may save time and expense later (see Sec. 172). 172. Trouble. — 1. The chief indications of trouble in a cell are: Falling off in gravity or voltage relative to the rest of the cells. Lack of gassing on equalizing charge. 2. If a battery seems to be in trouble, the first thing to do is to give it an equalizing charge (Sec. 161). Then take a gravity reading of each cell....
123 ページ - Fig. 1 shows a photograph of the light valve, invented in 1922 by EC Wente of the Bell Telephone Laboratories. Essentially, it consists of a loop of duralumin tape suspended in a plane at right angles to a magnetic field. The tape, 6 mils wide and 0.5 mil thick, is secured to windlasses A and A ' and stretched tight by the spring held pulley B.
462 ページ - ... new electrolyte. Do not allow a cell to stand partly empty. The amount to withdraw will have to be determined by trial, as it depends upon the gravities of both the old and new electrolyte. Charge until all cells have been gassing for 1 hr.
124 ページ - C' insulated pincers confine the central portions of the tape between windlasses and pulley to form a slit 2 mils wide. Supporting this loop and adjusting devices is a slab of metal with central elevation D, which constitutes the armature of an electromagnet. The central portions of the loop are supported on insulating bridges to lie 3 mils above the face of D; here the sides of the loop are centered over a tapered slot, 8 mils wide by 256 mils long in this plane, opening to 204 mils by 256 mils...