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MOTION PICTURE PROJECTION 105
connections from these devices run direct from the main switchboard and terminate in the box of main switchboard. It is possible, therefore, by plugging in one of the four machines into the pockets to operate on the different kinds of apparatus either A. C. or D. C., running one or four machines simultaneously.
All wiring of conduits are concealed in the floor and walls of the booth, and the wires leading to the machines, meters and arc switch come up directly in the centre of pedestal. Set flush in the wall directly underneath the lookout hole in front of each projector is a special control panel board of blue Vermont marble with a volt meter and ammeter mounted on the face of the same, and Robin Cinema electric speed indicator. There is also provided a radial rheostat switch connected to the multiple unit rheostat. This switch is used to control the amperage at the arc which may be run from 5 to 100 amperes. This marble cover on panel board is arranged with hinges to open down into the booth, thus rendering it accessible.
In addition to the general booth equipment there is shown to the rear of the booth in photograph the motor generator testing department. In this space are five different types of motor generators, both single and two phase, with special panel board in front of each one with control switches and instruments.
Each generator is mounted on an iron pan, which is attached to frame and rests on cork and rubber to prevent noise when in operation. The top of the platform is covered with a battleship linoleum bound