It is only necessary to inspect the annexed figure to get an accurate idea
of this system of distribution. C represents the building in which the
generator of electricity, D, is placed; B, the public street, and Q the
house of a subscriber. The principal line, E, starts from the terminals,
_a, b_, of the machine, passes through the primary bobbins, G, and is
closed through the earth at F. It will be seen that the primary current
communicates through _d_ and _c_ with the internal winding of the bobbins,
G, while the secondary currents, H, are connected through _e_ and _f_ with
the external winding. The same arrangement is repeated for the tertiary
currents, M, and the quaternary ones, _o, p_. In the annexed example all
the lines that run parallel with the axis of the streets are closed
through the earth, while those that have a direction perpendicular thereto
enter the houses of subscribers and form a closed circuit. In the interior
of these houses the wires, as well as the induction coils, are insulated
and applied to the walls. At Q is represented the arrangement that would
have to be adopted in the case of a structure consisting of a vestibule,
_r_, and two rooms, _s_, lighted by two electric lamps, R. In the portion
of the figure situated to the left it is easy to see the process employed
for insulating the line.
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