Henry and Hora's modern electricity; a practical working encyclopedia (1915)
Henry, James. [from old catalog], Hora, Karel Jan, 1881- [from old catalog] joint author · Chicago, Laird & Lee, inc. · leaf 218
xclusion of moisture. A subway is a tunnel underground, of sufficient dimen-sions to permit the easy passage of a man. In the tunnelthe electric cables and wires, also gas and sewer-pipesetc., can all find place, and it is easy to reach any spot.But the great expense of construction, and the want… … Fig. 89. One kind of conduit is made ot perforated blocks ofearthenware or wood, six feet long, especially prepared withcreosote or asphalt, see fig. 89. Theblocks are laid end to end and jointedby a saddle piece of the same material.The cables or wires are drawn in bymeans of ropes, from one…
Electrical engineering
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