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33 THE BOY ELECTRICIAN

each terminate in brushes of tinsel which electrically excite
the “ sectors ” as the plates revolve. The electricity is
collected by a set of “ collectors ” arranged in a somewhat
similar manner to the collector. on the cylinder electric
machine.

The Glass Plates are each eighteen inches in diameter.
Purchase two panes of clear glass twenty inches square

 

 

 

 

 

 

 

FIG. 34. —Paper Pattern for laying out the Plates.

from a glass dealer. The white glass is far preferable to the
green glass and will make the best electric machine. The
plates should be of the thickness known as “ single light ”
and should be perfectly free from wavy places, bubbles, or
other imperfections. .

The work is first laid out on a piece of stiff paper twenty

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