Switchboards for power, light and railway service, direct and alternating current, high and low tension . the back of the boardare also, provided lightning arresters for all the con-ductors. This board is arranged for operating an electricrailway, and it only requires one distributing panel,because the road is small. It will be noticed that thisboard is made up of panels that are duplicates of eachother, so that if at any time it becomes necessary to en-large the plant, the switchboard can also be enlarged bythe addition of more panels. T ? T Switchboards for arc-lighting circuits. The constru
Switchboards for power, light and railway service, direct and alternating current, high and low tension . the back of the boardare also, provided lightning arresters for all the con-ductors. This board is arranged for operating an electricrailway, and it only requires one distributing panel,because the road is small. It will be noticed that thisboard is made up of panels that are duplicates of eachother, so that if at any time it becomes necessary to en-large the plant, the switchboard can also be enlarged bythe addition of more panels. T ? T Switchboards for arc-lighting circuits. The construction of arc light switchboards is verysimple in comparison with constant potential difference arises from the fact that each machine 96 Arc lighting. is arranged so as to feed into a single circuit, and alsobecause circuit breakers and voltmeters are not simple arc light board for four generators is shown inFig. 50. It consists of a marble slab which carries eightplug receptacles at the upper edge, and eight more at thebottom, and an ammeter in the central space. Eight wires. Figure 50Simple arc light switchboard. running from the terminals of four machines are con-nected wdth the eight lower receptacles, and eight linewWqs are connected with the eight upper means oi the flexible cables shown, any one of thelower receptacles can be connected with any one of theupper ones, as is clearly indicated in the illustration. A 97 Arc lighting. voltmeter is not required, owing to the fact that the e. of the generator is continually rising and falling in ac-cordance with the demands of the circuit. If the num- ®u C- ^ ? UlTu ^ /n—^ ^i|—^ J^ Jj^
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1906
