International Library of Technology · Scranton, International Textbook Co. · leaf 128
Fig. 16. the mandrel is drawn along through the duct by the work-men, by means of an iron hook at the end of a rod about3 feet long, the method of doing this being shown in Fig. 16.By this means, the formation of shoulders on the inner wallsof the ducts at the joints is prevented, and any dirt…
Electrical engineering
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