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 332
w y-jumper TROLLEY 13 insulator/spanwire FEEDERS feeder tap … -e*®- SPANWIRE Fig. 156. 330 MODERN ELECTRICITY Allowing a safety of 2, 18*4 tons would be the safe loadper square feet. The bearing power of different soils, ranges from 30 tons,(for hard rock,) to one ton, (for quick sand,) per square foot.The foundations for machinery should be built of good…
Electrical engineering
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