Exhibitors Herald World (Oct-Dec 1930)

42 EXHIBITORS HERALD-WORLD November 29, 1930 Tl, are connected to the plate and grid of VI and the plate and grid of V2, respectively. Wires A-l and C-l, coming from the opposite ends of the secondary winding of T2, are connected to the filaments of VI and V2. Therefore, when the current in the secondary winding of Tl is making wire C positive, the grid and plate of VI will be positively charged, and the current would then flow from the filament, it being negatively charged, thence, following the same path as the current coming from VI, during the preceding half-wave followed. During the time the current is flowing through V2, of course, no current could flow through VI, its plate and grid being negative. It follows from this that both halves of the alternating current will be used if two tubes are employed in this manner. "The use of two tubes does not produce Diagram illustrating answer to Question No. 45 to the grid and plate, then through wire C to the secondary winding of Tl, and passing out then through the center tap of this winding to wire B, which carries it to the load after passing through the filter. After passing through the load, the current flows, via wire B-l, to the center tap of the secondary winding of T2, and then out through the two halves of this winding to wires A-l and C-l, which are connected to the filaments of the two tubes. During this time, the current coming from the opposite end of the secondary winding of Tl, via wire A, would be making the plate and grid of V2 negative, therefore no current could flow through V2. But during the next half-wave, the situation would be exactly reversed, the current in the secondary winding of Tl making the plate and grid of V2 positive, and of VI negative. The current would then flow, via wire A, to the secondary winding of Tl, and out through the center tap of this winding to wire B, true direct current because of the fact that the peak of each half-wave of the alternating current is not reached instantly, but increases and decreases gradually. Therefore, the product of a two-tube rectifier, unless the further use of a filter is employed, is not true direct current, but a strongly pulsating current. "Non-pulsating current is derived from a two-tube rectifier by the use of a filter, which is a combination of condensers and choke coils. The condensers act as electrical shock absorbers, and the choke coils act as electrical inertia, thus smoothing out the vibrations in the current and making it into true direct current. "The contact points of a rectifying tube should be cleaned only with a rubber eraser or some other non-abrasive material. The use of anything of a rough character is likely to do more harm than good." Sound Pictures Not New in Omaha; Had Them Back in 1906 Talking pictures of a kind were presented to Omaha theatregoers as far back as 1906. Records show that the Elite theatre, on Douglas street near Fourteenth, had a presentation called the "Cameraphone." It was an attempt to use an Edison graphophone backstage in synchronization with the recital of the story shown on the screen. Mrs. Blanche Scott Lee, of Council Bluffs, in a newspaper feature story interview published in Omaha, describes how she entertained "nickelodeon" fans of a quarter century ago in both Council Bluffs and Omaha on the same day crossing the Missouri river between acts to be at one or the other theatre in time and then rehearsing for the next day's picture before calling it a day after the last show late at night. Songs she sang in her day included "After the Ball," "Ben Bolt," "The Sunshine of Paradise Alley," and similar popular melodies of her time. Italians Disappointed With Language in First American-made Talker (By Special Correspondent) ROME, Nov. 28.— Exhibition of the first American-made talker in the Italian language proved disappointing entertainment when it was shown in this country. The picture was "You Are the Love." It was screened at the Odeon theatre in Milan. Italotone Film Productions is the producer. The principal defect was in the dialog. The actors did not speak true Italian and one had a heavy Lombard accent. N. Y, Local Sponsers Inspection Service In Union Theatres (Special to the Herald-World) NEW YORK, Nov. 28.— Sam Kaplan, president of Local 306 of the Motion Picture Machine Operators Union has inaugurated a detailed inspection service to cover every union operated theatre in greater New York. The personnel of the inspection staff will be composed of carefully selected expert projectionists and sound engineers who will check on every phase of projection and sound reproduction. The service is a voluntary offering on the part of the projectionists' union and will involve no charge to the exhibitor. In addition the members of the inspection gioup will be available for emergency service at any time during the day or night. A set of regulations which have been prepared by Kaplan in order that the service may be effective and efficient note in particular that any operator found smoking in the projection booth will be liable to instant dismissal by the union; that a man who leaves his machine while it is running will be brought before the executive board and severely penalized; and that in case of an emergency necessitating the operator leaving his booth, he must first call his relief operator to take charge. Other regulations are as follows: 1. All fire department regulations must be strictly adhered to. 2. The booth must be in a clean and sanitary condition at all times. No oil or waste on the floor. No pieces of film on the floor, no dirt of any kind permitted. 3. All ventilating shafts must be free and clear of all dirt and dust. 4. No doubling of film permitted. 5. Absolutely no visitors permitted in booth. 6. No eating in the booth allowed. 7. All film must be carefully inspected before running. Any imperfections in print must be noted and reported to theatre manager. 8. Any and all fires must be reported immediately. 9. Before starting show, operator must see that machines are in perfect condition, check up on all sound apparatus and have on hand all necessary supplies such as extra carbons, amplifier tubes, exciter lamps and photoelectric cells. 10. All films not actually in use must be kept in cabinets. 11. All fire and sand pails must be in place and pyrene extinguishers must be inspected and full. 12. Working schedule must be posted in a prominent place. 13. No changing of shifts or of days off is permitted without permission of the executive board. 14. Any or all questions of doubt in regard to any procedure must be submitted to the inspectors who are the official emissaries of the union. Appeals from their decisions may be made to the executive board. Fire Destroys Sound Equipment of Theatre (Special to the Herald-World) _SAN AUGUSTINE, TEXAS, Nov. .28. — Fire believed to have started in a projection machine caused damages estimated at $1,500 to sound equipment of the August theatre here. The loss is partially covered by insurance. There was a crowd in the house but all marched out in orderly fashion and no one was injured. Firemen confined the blaze to the projection room. Mrs. W. M. Wade is the owner.