Electrical tables and engineering data; a book of useful tables and practical hints for electricians, foremen, salesmen, solicitors, estimators, contractors, architects and engineers (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 266
ome kind of clay, concrete or fiber, andtheir heat conductivity is generally not as good as 264 ELECTRICAL TABLES AND DATA that of moist earth. Conduits arranged as shown inFigure 32 carry away more heat than those shownat Figure 33, but if there are many^of them they alsorequire more trench area.… … Figure 32.
Electrical engineering
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