Had this accident
occurred to generators unprovided with regulators, great injury or
possible destruction of the apparatus would have resulted. It is
important to a full understanding of the regulation, to state that its
action is independent of resistances introduced, that it saves power
and carbons in proportion to lights extinguished, and that it
compensates for speed variations above the minimum speed. The manner
of its action is to control the generation of current at the source in
the armature, and it does so by combining certain electrical actions
so as to obtain a differential effect, such that when small force of
current only is required it alone is furnished, and when the maximum
force is needed the same shall be forthcoming.
[Illustration: THE CONTROLLER MAGNET.]
On the larger generators we combine with the regulator magnet above
described an exceedingly sensitive controller magnet governing the
regulation, and by whose accuracy the smallest variations of current
are counteracted, and the operation of the generator rendered perfect.
The controller magnet is contained in a box placed on the wall or
other support near the generator, and consists of a delicate double
axial magnet controlling the admission of current to the regulator,
upon the generator, and its action is exceedingly simple and
effective. So perfect is the action that in a circuit of twenty-five
to thirty lights, lights may be removed or put out in rapid succession
without apparently affecting those that remain.
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