International Library of Technology · Scranton, International Textbook Co. · leaf 130
t6 inches thick. The walls, if of brick, should be laid incement mortar, and should, also, be thoroughly plasteredon the outside with the same mortar. They should neverbe less than 8 inches thick, and should be made double thisthickness where large manholes are being constructed inbusy streets. As… … ■^-3 Pipe. Concrete 6tn/ck. ^BocA water t/a/i/e. Fig. 17. in. The roof should be of either arched brick or structural
Electrical engineering
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