In dynamo electric machines the current is not absolutely
continuous or uniform, since the coils on the armature being separated a
distance cause a slight break or diminution of the current between each.
This break is so short that it does not interfere with the practical
work for lighting; in some constructions, nevertheless, the distances
apart is so great that, while not interfering with light, its effects
upon the muscles are greatly increased over those of other constructions
which give a more uniform current.
All these statements might lead to the conclusion that arc light wires
are dangerous under any circumstances; but this is not the case. The
first and only requisite is, that they be perfectly insulated. When thus
protected accidents from them are impossible, and all mishaps that have
occurred through them can be traced directly to the lack of insulation.
Nevertheless, we would warn our readers against experimenting upon arc
wires by actual trial, because unforeseen conditions might lead to
disagreeable results.
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