Motion Picture News (Jul-Aug 1923)

August ii, 1923 697 Navy Has Unique School A school is maintained at New York for rated naval electricians, who are sent from all over the world, by their commanding officers, to take an eight-week course in the operation of projection machines and the detail of routing or booking of programs. This course has surprised the bureau, by its immediate improvement in projection afloat, and ashore, and the increased efficiency of the operators, who, now, are men that know that films are costly playthings, and require careful atten. tion. Soine eight hundred men under six directing officers are usually in training at this naval movie college. At the present time sixteen million feet of film are in use in this service, and their reserve vaults are so ample that rumor is saying the President may be offered the use of the valuts for federal film archive storage. — Knappen. Simplified Electricity Pro jectionists for New Theatre for Waycross, Ga. Messrs. A. R. Hood and L. B. Harrell have announced that the plans for their new theatre building were being drawn and that actual construction would begin as soon as preliminary work could be completed. The new theatre will be located on their property opposite the Bunn Building and will be 55 x 100 feet in size. The stage will be of such a type as to accommodate vaudeville and the best plays and musical comedies in addition to photoplays. The seats will be beautifully upholstered and designed with a view to the comfort of the spectator and the balcony will be of oval design in addition to which will be the dressing rooms, orchestra pit, box office, a handsome foyer, and ladies' rest room, etc. On top of the building will be a roof garden thus giving Waycross an added and needed attraction. The new house will seat 1.000. U. S. and Canada Agents for DEBKIE CAMERAS EVERYTHING FOR THt MOTION PICTURE STUDIO and LABORATORY Send for Catalogue MOTION PICTURE APPARATUS CO. 118 WEST 44th STREET NEW YORK CITY Ownership Management of Wffloughby Corporation 110 W. 32d St, N. Y. City Voltage Characteristic? The terminal voltage of any storage cell is different when charging than when discharging. Thus: Et = Eb + IR, when charging. Et = Eb — IR, when discharging. Eb is the voltage generated by the battery. I is the current and R the internal resistance of the battery which is usually quite low, being between .001 and .002 of an ohm. It can be seen from this that the charging voltage is higher than the discharge voltage by twice the amount of the voltage drop due to the internal resistance of the cell. The in loo 3 4 5 6 7 Time m Hours Figure 90 ternal resistance varies with the density of the electrolyte. During discharge the acid becomes weak and the internal resistance rises. This, of course, has an effect on the terminal voltage both when charging and discharging. A typical voltage curve of a storage cell is shown in Fig. 89. Much depends, of course, upon the rate at which the cell is charged. Rate of Discharge The capacity of a cell depends largely upon the size of plates used and the surface of the plate exposed to the action of the electrolyte. These properties, naturally, are fixed in any particular cell. The capacity also depends to a considerable extent, upon die rate at which the cell is discharged, meaning the amount of current drawn from the cell over any period of time. The capacity is rated at so many amperes supplied for a certain period of time. Thus a 100 ampere-hour battery could supply 100 amperes ofr 8 hours, 85 amperes for 4 hours, etc. The more current drawn from the cell the quicker it will be discharged and the less will be its ampere-hour capacity, so that cells should always be discharged at their 8hour rate whenever possible. Fig. 90 shows how the ampere-hour capacity of a typical lead cell varies with thedischarge rate. Thus at 1 hour the capacity is 50 amper.-hours (50 amperes), at 4 hours it is 85 amper.-hours (21 amperes) and at 8 hours it is 100 amp.-hours (12.5 amperes). This, of course, only applies to the particular battery in mind but all other batteries act similarlv. usiness fe rings WAXTED — Position in picture theatre by experienced projectionist and pianist, man and wife. Best references. West preferred. Box 390, Motion Picture News, New York City. Situation wanted by competent projectionist; twelve years' experience. All standard equipment. Best references. Box 163, Belmont, Mont. WANTED — Organ Salesmen and Sales Managers for Branch Sales Offices in Southern, Western and Central United States to sell the highest class theatre organs, also the Page Organ Player, which can be attached to any organ and plays it by the use of ordinary piano player rolls, selecting the solo or obligato, and plays as the artist would play it. Give full information regarding your experience. The Page Organ Company, Offices and Salesrooms, 404-10 North Main Street, Lima, Ohio. Must sell at a sacrifice UNIVERSAL MOTION PICTURE CAMERA with Zeiss Tessar lens F 3.5. tripod, carrying case, extra magazine and sun-shield, all in perfect condition, having seen very little use. Price $275. U0 cash Write Mr. .George Manierre, 622 Colby Abbot Building, Milwaukee, Wis. Want to rent or buy moving picture theatre in town of 2000 to 10.000. Address Mrs. Anna Newmann, 2SS0 Elston Avenue, Chicago, 111. RadiO -vw Mat 50 RADIO-MATS WHITE, AMBER or GREEK. At your Dealer. is the Stationery of the Screen _ Rich color effects in your electric signs Just snap a Reco Color Hood over bulb and brilliant color replaces the ordinary white light. Cost is small. Effect is wonderful. Reco prices are now lower. Write for bulletin. ■t» YNOLD CI J-^^J tLICTRIC COMPANY kT^^F Mfrs. of Reco Motors, Flashers, etc 2628 W. Congress St. CHICAGO ■WE ID0N.W1 LLIAMS & LICK PORT SMITH, ARK. TYPHOON COOLING SYSTEM ■ TYPHOON FAN CO. 345W.39-ST. U NEW YORK