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MANAGERS AND PROJECTIONISTS 593
as per instructions mounted on front cover of the rectifier. Connect leads D — and C + to the projector table switch with the positive (+)> B, Plate 3, connected to the top carbon arm and the negative ( — ), A, Plate 3, connected to the lower carbon arm. Open the crate containing the tube by removing two screws from the center of each side. Lift the outer portion of the crate away, which will leave the tube suspended from the inner portion of the crate. Loosen the line tape and lift the tube carefully from the holder. Turn the tube upside down, slowly and very carefully, making sure that the mercury runs slowly into the two bottom terminals. The mercury in a tube that is in good condition should make a sharp metallic click when passing from one end of the tube to the other. Grasp the tube firmly in both hands, the right at the extreme top and the left grasping the mercury terminals, and, guarding carefully against collision, slide the tube into the lower spring clips of the tube holder, taking care that the springs do not cause the ^. ir.r
tube to slide into the Flgure 195a"
tube holder with a jar.
Be very careful not to allow the smaller mercury terminal to strike the tube holder, or any other object, as it is quite easily broken. After the lower part of the tube is properly placed, push the top part gently back into the upper spring. If it becomes necessary to remove the tube, as in case of changing location of outfit, the same method of handling should be followed. Connect the tube leads (that is, the flexible wires attached to the terminal board below the tube marked L, M, N, and O, Plate 2) to the tube, as shown at 9, 9, 12, 29, Plate 4. The wires may easily be traced in Plate 4. Connect wire 4, Plate 2, to the upper left hand tube terminal, 9, Plate 4; the lead M to the small lower tube terminal, 29, Plate 4; lead N to the large lower terminal, 12, Plate 4, and lead 0, the last one, to the right hand upper terminal, 9, Plate 4. The upper link connector on the slate panel at the top of the outfit should now be connected to suit the voltage of the supply wires, which should be determined by actual test with a reliable voltmeter. It may