. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. tram, and then lowered down the side of the cliff to their places. Thespans were very uneven and varied from 50 to 100 yds. according tothe nature of the ground. The voltage of 750 was chosen in order to be under the same 492 MACHINERY FOR METALLIFEROUS MINES. conditions as the electric tramway, so that, if need be, we could assistthem with our current or they with theirs in case of breakdown at eitherof the stations. Before the generating dynamo had arrived we hiredcurrent fro
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. tram, and then lowered down the side of the cliff to their places. Thespans were very uneven and varied from 50 to 100 yds. according tothe nature of the ground. The voltage of 750 was chosen in order to be under the same 492 MACHINERY FOR METALLIFEROUS MINES. conditions as the electric tramway, so that, if need be, we could assistthem with our current or they with theirs in case of breakdown at eitherof the stations. Before the generating dynamo had arrived we hiredcurrent from the tramway company, and worked five of our motors withit, the price paid being 40 francs for 47 kilowatts (or about 63 horse-. FiG. 320.—Type of Elixtromotor. power) per i6 hours. The tramway naturally use their rails from thereturn circuit, so that a temporary connection was easily made betweenour line wires and their overhead wire and the rails, the arrangementworking most successfully for nearly two months until our own powerstation was complete. Generati?ig Dynamo.—The type of this machine, known as H THE riERREFITTE ELECTRIC POWER STATION. 493 by the Creusot Company, is shown in fig. 319 from which it will beseen that it has six poles. When running at full power it requires 420horse-power, and it is coupled direct on to the axle of the turbine asshown in fig. 318, which is a general view of the interior of the machine-house. The method of coupling is shown in fig. 319, where a numberof turned steel pins are shown projecting from the coupler. There isa similar arrangement on the coupler on the turbine shaft, and thesepins are connected together, either by strong indiarubber rings or bymeans o
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