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MANAGERS AND PROJECTIONISTS 95
switches on the main switchboard, and thus set up a tremendously dangerous condition. Place the emergency light switches in the box office, where nobody can get at them but the ticket seller, and make him or her directly responsible for their handling.
In the projection room, local conditions will govern the placing of switches, but it should be remembered that nothing can possibly be gained by making things inconvenient for the projectionist. Wrongly located switches often cause much entirely unnecessary labor and annoyance; also inconveniently located switches cause delay, and make the proper handling of the program impossible.
The projection room incandescent lights should, as a whole, be governed by one switch, located within convenient reaching distance from working position at either projector. This will enable the projectionist instantly and fully to illuminate the room, or to cut off all lights instantly and conveniently, which latter is the best condition for projection. Each lamp socket should, however, have an individual snap switch.
This is of paramount importance, because it is impractical, not to say impossible, under conditions usually found in projection rooms, to produce the best possible screen results with incandescent lights burning, and the projectionist is more apt to extinguish his lights if there is a switch handily located with which he can put them all out or on with one operation than if he has to turn them off by using two, three or more switches. This Is one of the seemingly unimportant points which is of great importance to results on the screen. See page 345 for modification.
USE OF TYPES OF SWITCHES.— Except for very limited purposes the use of the single pole knife switch is prohibited by underwriters' rules. So far as we are aware, none of the purposes for which a single pole switch may be used exists in a theatre, except in making certain 'rheostat connections, as will be explained under the heading "Rheostats."
The D. P. S. T. switch is the type ordinarily used to control all incandescent and projection circuits, except those controlled by triple pole or D. P. D. T. switches. The T. P. S. T. is used to control three-wire circuits where they enter a theatre, and wherever else the three-wire circuit may extend. D. P. D. T. switches are used in certain fuse connections, as will be explained under "Fuses." These switches are also used for connecting two separate two-wire supply systems, and for