--Contributed by J.E. Dussault, Montreal.
** How to Make a Three-Way Cock for Small Model-Work [50]
[Illustration: Three-way Valve]
In making models of machines it is often necessary to contrive
some method for a 3- or 4-way valve or cock. To make one, secure a
pet cock and drill and tap hole through, as shown in the cut. If
for 3-way, drill in only to the opening already through, but if
for a 4-way, drill through the entire case and valve. Be sure to
have valve B turned so as to drill at right angles to the opening
through it. After drilling, remove the valve, take off the burr
with a piece of emery paper and replace ready for work.
** Easy Experiments with Electric-Light Circuit [50]
An electric-light circuit will be found much less expensive than
batteries for performing electrical experiments. The sketch shows
how a small arc light and motor may be connected to the light
socket, A. The light is removed and a plug with wire connections
is put in its place. One wire runs to the switch, B, and the other
connects with the water rheostat, which is used for reducing the
current.
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