The oven is now ready
to be connected.
Withdraw the wooden core from the coils of wire and secure the
latter by bands of tin to the board. Connect the ends of the wire
to binding-posts E and F, as shown. From the other set of
binding-posts, E, run a No. 12 or No. 14 wire, connecting lamp
receptacles, B B, and switch, C, in parallel. Connect these three
to switch, D, in series with binding-post, F, the terminal of the
coil. Place 16-cp. lights in the receptacles and connect the fuses
with a 110-volt lighting circuit. The apparatus is now ready for
operation. Turn on switch, D, and the lamps, while C is open. The
coil will commence to become warm, soon drying out the
plaster-of-paris. To obtain more heat
[Illustration: Electric Furnace]
open one lamp, and to obtain still more open the other and close
switch C.
--Contributed by Eugene Tuttles, Jr., Newark, Ohio.
** How to Make an Ammeter [49]
Every amateur mechanic who performs electrical experiments will
find use for an ammeter, and for the benefit of those who wish to
construct such an instrument the following description is given:
The operative principle
[Illustration: Complete Ammeter and Details]
of this instrument is the same as that of a galvanometer, except
that its working position is not confined to the magnetic
meridian.
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