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188 THE BOY ELECTRICIAN

Four binding-posts are mounted on the lower part of the
base-board. The two marked B and B are for the battery.

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DETAIL 3 01“ p05”
Barron!

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HOOK
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DETAILS
or Hook

FIG. r49. — A Complete Telephone Instrument.
Two Instruments such as this are necessary to form a simple Telephone System.

That marked L is for the “ line,” and G is for the ground
connection or the return wire. '

The diagram of the connections is shown in Figure I so.

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