* * * * *
Borax may be used as a solvent for shellac gum.
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** How to Make a Small Single-Phase Induction Motor [124]
By C. H. Bell
The following notes on a small single-phase induction motor,
without auxiliary phase, which the writer has made, may be of
interest to some of our readers, says the Model Engineer. The
problem to be solved was the construction of a motor large enough
to drive a sewing machine or very light lathe, to be supplied with
110-volt alternating current from a lighting circuit, and to
consume, if possible, no more current than a 16-cp. lamp. In
designing, it had to be borne in mind that, with the exception of
insulated wire, no special materials could be obtained.
[Illustration: Motor]
The principle of an induction motor is quite different from that
of the commutator motor. The winding of the armature, or "rotor,"
has no connection with the outside circuit, but the current is
induced in it by the action of the alternating current supplied to
the winding of the field-magnet, or "stator." Neither commutator
nor slip rings are required, and all sparking is avoided.
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