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In view of these conditions it is the practice to lay the "Mains," which are to supply the current to the lamps, only through the streets where the lamps are to be used. This is shown in Fig. 14 which represents the map of a section of a city district.
Fig. 14.
The mains are laid underground on both sides of the street; and are joined gether in "Man-Holes" or "Junction-Boxes" at the corners.
Into these junction-boxes are brought what are termed the "Feeders" which convey the current from the station to
