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Electrical tables and engineering data; (1920)

Horstmann, Henry Charles, 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & co · leaf 269

An illustration from Electrical tables and engineering data;, 1920, leaf 269
The switches Dand E are main switches controlling the coloredlamps. All lamps of one color should be connected toone or the other of these switches. From these three groups of switches circuits extendinto all borders, proscenium side lights and footlights,so that the color scheme may be carried out… … Figure 30. The fuses or switches controlling lights not usuallymanipulated by switchboard operator are generallyworked into the vacant spaces between the groupsmentioned above. All branch circuits are preferably located behindthe board. This will allow of trouble being instantlyrectified. *…

Electrical engineering

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