Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 865
exceptionthat the crushed stone may be considerably coarser. The walls ofthe manhole are then built of good brick-work of suitable thicknessand well plastered on the outside with cement mortar in order to UNDERGROUND CABLE CONSTRUCTION. 84S exclude as much dampness as possible. For the ordinary… … FIG. 619.-AVOIDING OBSTACLES. is good practice to allow about one inch air space between the outercourse of brick and the inner in order to render the interior as dryas possible. A common-sized manhole is five by five by five feet, andsmaller sizes down to three by three feet with five feet head…
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