. Official proceedings . Figure 12—Cut-Out Valve. Figure 12 is a cross-section of the cut-out valve, and clearlyshows how the air is cut off, the records made, and the signalgiven electrically when the valve is operated. Having shown the details of the instruments used on the en-gine, we will now turn our attention to a simplified wiring dia-gram of the cab circuits. 120 Proceedings Railway Club of Pittsburgh. Most of the instruments shown in Figure 13 we are alreadyfamiliar with, and 1 will, therefore, first eall attention to the insu-lation of one of the tender trucks here diagrammatically r
. Official proceedings . Figure 12—Cut-Out Valve. Figure 12 is a cross-section of the cut-out valve, and clearlyshows how the air is cut off, the records made, and the signalgiven electrically when the valve is operated. Having shown the details of the instruments used on the en-gine, we will now turn our attention to a simplified wiring dia-gram of the cab circuits. 120 Proceedings Railway Club of Pittsburgh. Most of the instruments shown in Figure 13 we are alreadyfamiliar with, and 1 will, therefore, first eall attention to the insu-lation of one of the tender trucks here diagrammatically repre-sented, the details of which will be given later. This insulation is made of vulcanized fiber inserted betweenthe body bolster and the center plate, or between the truck bolsterand the center plate. By the use of this insulation there is no me-tallic connection between the truck in question and the balance ofthe engine or train. Therefore, when one of the wires of a localbattery is connected to this insulated truc
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