. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . ing Tandem as Simple Engine. A tandemcompound can be operated as a simple engine onlywith the reverse lever in full gear. The low pressuresteam-chest is provided with a reducing and startingvalve, connecting with the high pressure steam-pipe. Thisvalve is permitted to operate automatically when the re-verse lever is in full forward or backward gear. In the in-termediate position of the lever it is locked to its seat by aspring, so that it is rendered inoperativ
. Locomotive text for engineers and firemen; a complete treatise on the engine, electric head-light and standard code of train rules . ing Tandem as Simple Engine. A tandemcompound can be operated as a simple engine onlywith the reverse lever in full gear. The low pressuresteam-chest is provided with a reducing and startingvalve, connecting with the high pressure steam-pipe. Thisvalve is permitted to operate automatically when the re-verse lever is in full forward or backward gear. In the in-termediate position of the lever it is locked to its seat by aspring, so that it is rendered inoperative. Fig. 1, Plate122, shows the range of the lift shaft arm for the startingvalve to be either opened or closed. The combinatioristarting and reducing valve permits the introduction ofsteam into the low pressure cylinder at an equivalent to COMPOUND LOCOMOTIVES. 269 the maximum pressure obtained in this cylinder whenthe engine is working compound. Fig. 2, Plate 122,shows the starting valve open. As soon as the engine hasmade one complete revolution and the receiver is chargedwith the exhaust steam from the high pressure cylinder,. 270 COMPOUND LOCOMOTIVES.
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