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MANAGERS AND PROJECTIONISTS 618
stands its operating principle; also because the average man very naturally does not like to operate something he knows nothing about. We, therefore, provide him a better means of getting the knowledge he desires than by tearing the machine to pieces.
CAUTION. — The controller must under no circumstances be connected to alternating current, or to any voltage higher than 115. Always place snap switch 5, Plate 1, in the "open" position after extinguishing the arc.
When it is desired to resume operation, first strike the arc by hand and set it to approximately proper length, after which turn snap switch 5, Plate I, in the "on" position. This latter is important, because if the projector table switch be closed when the arc is not in operation, as is not infrequently the case, the controller motor would be subject to voltage sufficient to place the carbon feeding mechanism in operation; also, if current be taken from 110 volt direct current lines through a rheostat, the motor would be operating at line voltage, because with such a very small current flow, the rheostat would not operate.
PEERLESS AUTOMATIC ARC CONTROL.— The Peerless Arc Control is of the automatic type, and is by far the simplest, both in mechanical and electrical construction, we have yet seen.
It consists essentially of a small motor, Q, Fig. 217, which drives gear T by means of worm gear S, the latter attached to the armature shaft. Gear T is attached to and drives upright rod B, into which square rod G telescopes. This latter is to accommodate varying heights, or in other words, to cause the length of combined rods B and G to be adjustable. Rod G, through another pair of worm gears, drives carbon feed rod P.
When the carbons are not being fed, motor Q and the mechanism stands still. The running of motor Q, and therefore the feeding of the carbons, is actuated by means of a circuit passing from the motor to snap switch K, through the box to which conduit O is attached. The circuit contained in conduit O passes dowm through the apparatus contained in the box and on through underneath the supporting stand to the motor.
The control may be used on any make of projector. It is designed to stand on the floor, as nearly as possible immediately under the arc lamp carbon feed handle, the complete assembly being illustrated in the diagram shown in Fig. 217, in which square rod G telescopes into a square opening in rod B, which makes the length of the combined