Each electric apparatus, whether it
be a lamp or other mechanism, is furnished with a special current. If the
number of these apparatus be increased, it is only necessary to increase
the number of bobbins in the same ratio, on condition, be it understood,
that the intensity of the currents remain sufficient to secure a proper
working of the apparatus in question. When such intensity diminishes to
too great a degree, the bobbin must be replaced by a stronger one.
[Illustration: DISTRIBUTION OF ELECTRICITY BY INDUCTION.]
It results from what precedes that each apparatus must be put in in such a
way as to permit, of the opening and closing of the corresponding circuit.
This arrangement, moreover, has no need of being dependent upon the
apparatus, and may just as well be transferred to any part of this same
circuit. As regards lighting, it is preferable to employ alternating
current dynamo machines; yet there is nothing to prevent the use of
continuous current ones, provided that there is an arrangement that
permits of constantly opening and closing this same circuit. That portion
of the line which is placed under ground is insulated in the ordinary way
at the places where it is necessary. As for the underground circuit and
the induction coils connected therewith, these are protected against all
external influence, and are at the same time insulated very economically
by covering them with a coat of very fine silicious sand mixed with
asphalt.
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