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Boards for multiple circuits.

each generator were connected with the same circuit at all times, but such is not the case in practice; for one reason or another the machines are frequently shifted from one circuit to another, so that machine No. I may be connected with circuit No. I one day and with circuit

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No. 20 the next day; hence, an arc light switchboard should be so arranged that any machine may be connected with any circuit, with the least amount of trouble and the least liability to create confusion in the connections, or to produce grounds, short circuits or cross connections. The sockets on switchboards of the type illustrated in

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Boards for multiple circuits.

each generator were connected with the same circuit at all times, but such is not the case in practice; for one reason or another the machines are frequently shifted from one circuit to another, so that machine No. I may be connected with circuit No. I one day and with circuit

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No. 20 the next day; hence, an arc light switchboard should be so arranged that any machine may be connected with any circuit, with the least amount of trouble and the least liability to create confusion in the connections, or to produce grounds, short circuits or cross connections.

The sockets on switchboards of the type illustrated in

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