Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 809
ones of varyingsize, up to the size of an egg, are somewhat cheaper than stones ofuniform size, because the small stones fill in the interstices betweenthe large ones, and thus require less cement, while the concrete isjust as strong. On a straight liiie three different kinds of strain must be… … FIG, 561.-DERRICK WAGON-MOVING WAGON TO NEXT POLE, at the end of the line, or to wind pressure in the direction of theline, or to the tension in portions of the line caused by the falling ofa pole or the breaking of a number of wires. In hilly country alsoconsiderable strain is caused In the…
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