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480 HANDBOOK OF PROJECTION FOR
on. If fuses are used in the supply circuit, they should carry current in excess of current indicated in nameplate as follows:
2-phase, 4-wire circuit, all leads, 25 per cent.
2-phase, 3-wire circuit, outside leads, 25 per cent., middle lead, 75 per cent.
3-phase, 3-wire circuit, all leads, 25 per cent.
If circuit-bre'akers are used in the supply circuit, they should be adjusted to open the circuit in accordance with the above.
Fuses in the starting circuit should carry four or five times the rated current.
LUBRICATION.— Before starting, fill the oil reservoirs with the best quality of clean dynamo oil; overflow plugs must always be kept open. The old oil should be withdrawn occasionally, and fresh oil substituted. The old oil may be filtered and used again. See General Instruction No. 3.
INSTRUCTIONS FOR OPERATING THE EQUIPMENT (TWO-LAMP INSTALLATION).—!. Before starting the motor-generator, see that all switches are open and that the ballast rheostat contact arms are on the right, indicated as button No. 7 in the diagram, Fig. 163.
2. Close the motor starting switch.
3. When motor generator reaches full speed, adjust the generator field rheostat until the voltmeter registers approximately 75 volts.
4. Close the cut-out switch on motion picture projector No. 1 and bring the carbons together. After the carbons have been warmed strike the arc by separating them slightly, and then close the single pole control switch, which short circuits part of the ballast resistance.
5. Adjust the carbons until the best possible operating condition is obtained. If the current is not of the correct value to give proper illumination of the screen, move the contact arm of the ballast rheostat to the left, one button at a time, until the proper illumination is obtained. The button which gives the proper illumination should be noted, so that it can be identified when projector No. 1 is again placed in operation.
6. A short time before the end of reel No. 1, close the cut-out switch on projector No. 2 in order to warm up the carbons.
7. After the carbons have been warmed, strike the arc and then close the single pole control switch, which short circuits part of the ballast resistance in ballast rheostat No. 2.