> > > >

1948-49 Theatre Catalog, 7th Edition, Page 345 (332)

1948-49 Theatre Catalog, 7th Edition
1948-49 Theatre Catalog
1948-49 Theatre Catalog, 7th Edition, Page 345
Page 345

1948-49 Theatre Catalog, 7th Edition, Page 345

THE EFFICIENCY CURVE of an autrastat dimmer is presented above. Voltage reductions on lamps with dimmer types of this kind are secured by direct transformer action and not on connected load.

adequately control the lighting on the stage.

These considerations usually indicate that for the small theatres the resistance type dimmer is perfectly adequate and costs the least to install. In extremely large theatres or where complicated productions may be presented, the

reactance dimmer with electronic control should be given serious consideration. However, for the average community theatre the Autrastat type of dimmer provides the most efficient and nexible lighting control at moderate cost.

Individual dimmer units are usually sufficient for the control of foyer and

A TYPICAL MOTOR OPERATED AUTRASTAT dimmer bank for a large theatre may be seen below. Such a bank would be capable oi serving a number oi house lighting circuits as well as stage play needs.

ABOVE may be seen an 8000 watt autrastat dimmer oi radial construction. brass contacts exposed.

lobby lighting. These may be mounted in cabinets located in the Manageris office or in a storage room adjacent to the theatre entrance, so that the intensities can be adjusted to suit the occasion. If no particular space is available for the dimmer equipment which can be reached for operation of the unit, it is possible to provide remote operation by means of a motor drive and to install the equipment at some point at which the electrical wiring and conduits are terminated. Control stations would then be located either in the Manager's office or in the lobby, controlled by the Head Usher.

The auditorium lighting should be controlled by dimmer equipment of sufc ficient rating to dim the entire auditorium lighting. If color is included in the lighting arrangement, separate controls for each color of house lighting should be provided. Furthermore, it is desirable to segregate the lighting in the rear of the auditorium and place it on a separate control so that slightly higher intensities can be made available in this section, thereby improving the gradual transition from the outdoor intensities into the main auditorium.

In theatres where there is no stage or no intention to provide any form of stage lighting, the auditorium dimmer equipment can be located so that it may be operated by the projectionist in the projection booth. The National Electric Code does not permit this apparatus to be installed directly in the projection booth. However, it can be located in the motor generator room if it is adjacent to the projection booth and the operating handles may be carried through the wall into the booth for operation by the projectionist. An alternate possibility, depending on space available directly above the projection booth, is to arrange the dimmers with extended rods and operating handles down through the ceiling of the projection booth, against the front wall and directly over the observation portholes. This arrangement is more convenient for the operator as he can manipulate the dimmers without moving from the projection machines. Duplicate control levers may be provided at each machine for convenience in operation.


J l
1948-49 Theatre Catalog, 7th Edition, Page 345