, currents. The principal line runs
through the streets parallel with their axes, and, when the arrangement of
the places is adapted thereto, it is closed upon the generator itself. In
those frequent cases where it is necessary to cause the line to return
over a path that it has already traversed, it is more advantageous to
effect the return through the earth or to utilize the street water mains
or gas pipes as conductors. This return arrangement may likewise be
applied to the lines of secondary, tertiary, etc., order, as may easily be
seen.
The induction is effected by the aid of bobbins whose interior consists of
a bundle of soft iron. The wire of the inducting current is wound directly
around this core. The wire of the induced current is superposed upon the
first and presents a large number of spirals. It is useless to say that
these wires must be perfectly insulated from each other, as well as from
the soft iron core. We shall call primary bobbins those which are
interposed in the principal line, and secondary bobbins those in which the
inducting current is a secondary one, and so on.
It will be at once seen that this arrangement permits of continuing the
distribution of electricity to the interior of buildings by the simple
adjunction of one or several bobbins.
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