In Fig. 97 the cooling water tank is shown,
for illustrative purposes, on the fly-wheel side of the engine, but can be
placed more conveniently behind the engine, as it were. Two short nozzles,
E1 and E2, of 1/4-inch tube are soldered into the water chamber near the
top and bottom for the rubber pipes to be slipped over, and two more on the
water tank. For the tank one may select a discarded 1 lb. carbide tin. Cut
off the top and solder on a ring of brass wire; make all the joints
water-tight with solder, and give the tin a couple of coatings of paint
inside and outside.
[Illustration: FIG. 102.]
Closing the Hot-air Chamber.--When all the parts except the lamp chamber
have been prepared, assemble them to make sure that everything is in order.
The lower end of the hot-air chamber has then to be made air-tight.
Soldering is obviously useless here, as the heat of the lamp would soon
cause the solder to run, and it is impossible to make a brazed joint
without unsoldering the joints in the upper parts of the engine. I was a
bit puzzled over the problem, and solved it by means of the lower part of
an old tooth-powder box stamped out of a single piece of tin.
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