The rotor is made of laminations cut from sheet iron, as shown in
Fig. 3, which were varnished lightly on one side and clamped on
the shaft between two nuts in the usual way. A very slight cut was
taken in the lathe afterwards to true the circumference. The shaft
was turned from 1/2-in. wrought iron, no steel being obtainable,
and is shown with dimensions in Fig. 4. The bearings were cast of
babbitt metal, as shown in Fig. 5, in a wooden mold and bored to
size with a twist drill in the lathe. They are fitted with
ordinary wick lubricators. Figures 6 and 7 are sections showing
the general arrangement of the machine.
The stator is wound full with No. 22 double cotton-covered copper
wire,
[Illustration: Motor]
about 2-1/2 lb. being used, and the connections are such as to
produce alternate poles--that is, the end of the first coil is
joined to the end of the second the beginning of the second to the
beginning of the third, and the end of the third to the end of the
fourth, while the beginnings of the first and fourth coils connect
to the supply.
The rotor is wound with No. 24 double cotton-covered copper wire,
each limb being filled with about 200 turns, and all wound in the
same direction.
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