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120 THE BOY ELECTRICIAN

The meter is now complete, except for marking or cali-
brating the scale. The method of accomplishing this will
be described farther on.

If the meter is wound with No. 36 B. & S. gauge Wire it
is a voltmeter for measuring voltage. If it is wound with

 

 

FIG. 105. —The Completed Meter.

N o. 16 B. & S. gauge wire it will constitute an ammeter for
measuring amperes.

A Portable Voltmeter and Ammetor

The bobbin upon which the wire is wound is illustrated in
Figure 106. The wood is the Spanish cedar, of which cigar
boxes are made. It should be one-eighth of an inch thick,
and can be easily worked with a pocket-knife. In laying
out the work, scratch the lines on the wood with the point

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