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MANAGERS AND PROJECTIONISTS 581
right side up. If you cannot get the split key in, the probability is that you have the nut wrong side up. Also, in replacing nut 9, be sure to get the two washers underneath it in place.
It will be well to clean the contact between block 7 and blade 6, Fig. 189, about once a month, using 00 emery cloth.
Should anything occur to seriously injure the parts on top of relay 4, Fig. 189, as for instance something falling on them and smashing the whole thing so badly that it could not readily be put back into shape, then new parts can be obtained from the factory. In order to remove the old parts, take out three screws in the top of block 10, Fig. 189, the same being countersunk into the block, two on one side of the brass parts and one on the other; disconnect the wires from the parts ; take out plunger 5, as per former directions. You can then lift the block off and replace it with a new one. The block should be ordered complete, with the parts assembled. Should it ever become necessary to remove the coil of relay 4, Fig. 189, first proceed, as before directed, to remove block 10, Fig. 189, whereupon you will see three screws in the top of the coil casing. Remove them, disconnect the two wires which lead from the coil, and disconnect wires (two of them) X, Fig. 189. You may then lift the coil out, and replace it with a new one if necessary.
The instructions given for removing the top and the coil 3f relay 4, Fig. 189, apply equally to all the other relays ; just remove the screws in the top of the block (the screws are, in all cases, countersunk), disconnect the wires, remove the relay plunger, and the whole thing comes off.
Resistance coil 9, Fig. 188, is connected in series with the contacts of series underload relay 11, Figs. 188 and 189. (You cannot see this relay in Fig. 188. It is under arrow head 11). This resistance is not in series with the relay coil, but serves to limit the flow of current through the starting anode, Fig. 185. But for this resistance the flow of current through the starting anode would be so heavy that there would be liability of damage to the tube.
Resistance coil 1 and 9, Fig. 188 may be removed simply by pulling them out of their clips as you would a cartridge fuse. Resistance coil 3 may be removed by disconnecting the wires attached to it, and taking out the screw which holds the carrying clip to the panel.
SHAKING MAGNET.—The action of the rectifier is made automatic by means of shaking magnet 13 and relay 8, Figs.