[Electric engineering.] . 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. this means, the formation of shoulders on the inner wallsof the ducts at the joints is prevented, and any dirt thatmay have dropped into the duct is also removed. The § 15 ELECTRIC TRANSMISSION. 13 cylindrical part of the mandrel insures good alinement ofthe ducts, thus securing a perfect tube from manhole tomanhole. 18. Fig. 16 illustrates the method of laying this con-duit, and shows h
[Electric engineering.] . 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. this means, the formation of shoulders on the inner wallsof the ducts at the joints is prevented, and any dirt thatmay have dropped into the duct is also removed. The § 15 ELECTRIC TRANSMISSION. 13 cylindrical part of the mandrel insures good alinement ofthe ducts, thus securing a perfect tube from manhole tomanhole. 18. Fig. 16 illustrates the method of laying this con-duit, and shows how the joints should be broken in thevarious layers so as to insure a maximum lateral strengthto the structure. All conduits should be laid to such grades that there willbe no low points or traps in the conduit that will not draininto the manholes. MAOTOLES. 19. Manlioles form a very important part in cable sys-tems and require careful designing to properly adapt themto the particular conditions to be met. They are usual
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