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1948-49 Theatre Catalog, 7th Edition, Page 353 (340)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 353
Page 353

1948-49 Theatre Catalog, 7th Edition, Page 353

tinuous heavy-duty commercial and industrial applications and emergency standby service. Of compact single unit design, they are supplied complete with engine and electrical controls, starting batteries and standard accessories mounted inside the housing. Tested and inspected, these units are shipped ready for immediate stationary or portable service. Heavy gauge sheet steel housing affords full protection for engine, generator and accessories; and removable panels and grilles make inspection and servicing easy.

When regular A.C. power service fails, the control panel automatically starts the engine-generator in 5 to 15 seconds, and switches the emergency standby power to the branch circuits. The standby plant automatically stops when regular service is restored. Interlocked contactors and special design make it impossible to have both normal and emergency power supplied simultaneously.

These units will perform equally well in an emergency lasting for several days as in one lasting but five minutes. Operating cost is negligible in standby appli cations with maintenance attention limchange and starting battery replacement every three to four years. An automatic battery trickle charger contained in the line transfer control maintains the batited to a weekly test run, occasional oil teries fully charged and it is necessary only to check water level, condition of battery, etc., at regular intervals. While the life of each unit depends to a great extent on hours run and care given, these units should provide dependable service for many years even with a minimum amount of care. Initial cost ranges from $1220 (approx.) to $3845 (approx.), depending on the rated output of the unit. Size and investment can be kept down by picking up only the important lighting circuits such as exits, lobby, ticket office, booths and stairways. Power loads can be limited to the motor generator for the projectors, sound amplifiers, heating and ventilating motors.

Life of the standby plant is indefinite. Depreciation can be spread over twenty to thirty years. It is advisable to select the standby plant from a responsible supplier offering equipment which, by

A TYPICAL STANDBY ELECTRIC PLANT INSTALLATION in the Garden, Pittsburgh. Pennsylvania. Two 10 KVA sets are used, one supplying 115/230 volt AC single phase for lighting circuits, the other a 10 KVA

230 volt three phase, supplying a 5

h.p. proiection and sound generator.

(Pbo/a cannery of Kobler C0.)

utilizing proven controls, assures dependable protection during emergencies. Before purchasing standby equipment, it is important to determine whether it meets local and state wide requirements and has insurance company approval.

Valuable Insurance

The storage battery system and the gasoline-driven electric generating plant described above are typical of the efficient equipment that is now available to motion picture houses. For emergency lighting only, a battery system fulfills basic requirements admirably. Where continued theatre operation is desired, an electric generating plant will furnish uninterrupted power and electricity in the required amount for thousands of hours, if necessary. In recent years, as the need for a private source of electricity has become more acute, the number of manufacturers building this equipment has increased. For the theatre owner, the important facts are these: the general availability of auxiliary power, and its value in eliminating the great dangers inherent in all power failures.

Theatre owners located in areas affected by electric power shortages, where voluntary or enforced reduction of power consumption is necessary, will get dual use from an independent electric plant. It can serve as an emergency standby source of electricity and also be used to reduce peak loads by regularly supplying certain portions of the lighting or power load, proportionately reducing the demand from power company lines.

Standby power is actually inexpensive insurance whose premium is a moderate initial investment and a very minor upkeep cost. However, look at the dividends! The prestige and confidence that such equipment commands from the public alone is of inestimable value. In actual dollars and cents, the saving of refunds from one or two performances may well write off the entire cost of the emergency unit. And how much the theatre owneris peace of mind is worth remains for him alone to decide.

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The editors of THEATRE CATALOG are grateful to: Messrs. Edwin C. Hinschoff and Virgil C. Gilbertson, of D. W. Onan & Sons, Inc., for information

and assistance in preparation; Mr. A. M. Dingee, of the Electric Storage Battery Company, for a wealth of data; Mr. F. W. Nelson, of Kohler Company, for some valuable source material; Mr. Hondley Blackmon, Managing Editor of ELECTRICAL WORLD, for kind permission to use an article from that magazine; and to Mr. Charles A. Scarlott, Manager, Engineering Publications, Westinghouse Electric Corporation, for his cooperation in allowing us to quote an excerpt from Mr. Priceis address, as published in the July, 1948, issue of WESTINGHOUSE ENGINEER.

1948-49 Theatre Catalog, 7th Edition, Page 353