International Library of Technology · Scranton, International Textbook Co. · leaf 131
■ v:, • .-■;.• ,.., . • , :.,■. .2^ •:-■■; … Fig. 19. with ventilated covers and good sewer connections than toclose them up tight, as was formerly done. If they aretightly sealed, gases are liable to accumulate and cause 16 ELECTRIC TRANSMISSION. § 15 explosions. In Fig. 17, the manhole is provided with twosewer connections, so that in case…
Electrical engineering
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