International Library of Technology · Scranton, International Textbook Co. · leaf 570
ormed to allow the water todrip off. A similar tube, onlylonger, is used for bringing wiresin through brick or stone walls.Fig. 24 is a long, straight, porce-FlG- 25- lain tube used for passing through walls or floors. Note that the head a is some distance fromthe end, so that when the tube is used…
Electrical engineering
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