Connect wires A to the armature and wires F to
the field of the motor. By this arrangement one, two or three and
so on up until all the battery cells are used and different points
of resistance secured on the coil of wire. The reverse lever when
moved from right to left, or left to right, changes the direction
of the armature in the motor from one way to the other.
--Contributed by J. Fremont Hilscher, Jr., West St. Paul, Minn.
[Illustration: Motor Reverse and Controller]
** How to Build a Grape Arbor [73]
A grape arbor made of white pine, put together as shown in the
sketch, will last for several years. The 2 by
[Illustration: Grape-Arbor Trellis]
4-in. posts, A, are 7 ft. long. The feet, B, are made 2 by 4 in.,
4 ft. long, and rest on a brick placed under each end.
** How to Make a Toy Steam Engine [73]
A toy engine can be easily made from old implements which can be
found in nearly every house.
[Illustration: Toy Steam Engine Assembled]
The cylinder A, Fig. 1, is an old bicycle pump, cut in half. The
steam chest D, is part of the piston tube of the same pump, the
other parts being used for the bearing B, and the crank bearing C.
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