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372

THE BOY ELECTRICIAN

The other terminal of the field is connected to the lever, A.
B connects to the other terminal of the battery.

 

  
 

PIVOT

“Loon/r401-
0

FIG. 315. — A Pole-Changing Switch or Current
Reverser.

The Connecting Strip is pivoted so that the Handle will operate
both the Levers, A and B.

G‘ONNECT-
IN. 678 '

 

 

 

When the switch
handle is pushed
to the left, the
lever A should rest
on the left-hand
contact, D. The
lever B should
make contact with
C. The motor will
then run in one
direction. If the
handle is pushed
to the right so
that the levers A
and B make con-

tact respectively with C and D (right-hand), the motor will
reverse and run in the opposite direction.

A COMPLETE WIRELESS RECEIVING SET

Many experimenters may wish to build a wireless receiv-
ing set which is permanently connected and in which the
instruments are so mounted that they are readily portable
and may be easily shifted from one place to another With-
out having to disturb a number of wires.

The receiving set shown in Figure 316 is made up of some
of the separate instruments described in Chapter XIV,

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