. Carnegie Institution of Washington publication. Section 28.—Modifications of the Apparatus. 65 by brass pieces bolted to the inner sides (Alf AS) of the bath, and is rotated by means of two cranks C1 and C2, at right angles to each other, and of the eccentric rods ax and a2, which extend up through the cover of the bath. The ends of these rods are grasped in the fingers, and rota- tion is secured by alternately pulling and pushing them. Electrical connection with the outside of the bomb is secured through the carriage, the supporting piece B, and the copper wire W, which is brazed into the l
. Carnegie Institution of Washington publication. Section 28.—Modifications of the Apparatus. 65 by brass pieces bolted to the inner sides (Alf AS) of the bath, and is rotated by means of two cranks C1 and C2, at right angles to each other, and of the eccentric rods ax and a2, which extend up through the cover of the bath. The ends of these rods are grasped in the fingers, and rota- tion is secured by alternately pulling and pushing them. Electrical connection with the outside of the bomb is secured through the carriage, the supporting piece B, and the copper wire W, which is brazed into the latter. Connection with the lower electrode is secured through the flexible copper lead-wire Llf the insulated steel ring P1} into which the lead-wire is brazed, the insulated brass piece Du on which the ring P1 rests, and the copper wire Wx, which is brazed into Z),; and, simi- * larly, the upper electrode communica- tion is through L2, S„, P,, D2, and W2. The method of insulating P1 from P., and P2 from R will be clear from the diagram. In this diagram .1/ denotes mica, and K is simply a checknut to keep the rings from turning on the shaft. As the insulated pieces D1 and D2 have to support half the weight of the bomb, they, in turn, have to be securely fastened to the inner wall of the bath. The method for securing this support and at the same time insulation by means of mica is shown in fig. 15, in which the lettering is the same as in fig. 14. To be sure of low resistance con- tacts the ends of the steel shaft and the brass supporting pieces must be thoroughly cleaned before the bomb is put into the bath. For convenience in manipulation, Fi8. 15. the carriage, 5\iv?5\,, is supported when not in the bath, by resting the ends of the shaft in a wooden U-shaped stand. The bomb when ready is screwed to the carriage and the flexible lead-wires bolted to the electrodes. It can then be picked up and lowered into the bath by means of a double-pronged hook which slips into two bra
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