The amounts
necessary for a 10-ft. balloon are 125 lb. of iron borings and 125
lb. of sulphuric acid. 1 lb. of iron, 1 lb. of sulphuric acid and
4 lb. of water will make 4 cu. ft. of gas in one hour. Secure two
empty barrels of about 52 gal. capacity and connect them, as shown
in Fig. 5, with 3/4-in. pipe. In the barrel, A, place the iron
borings and fill one-half full of clear water. Fill the other
barrel, B, with water 2 in. above the level of the water in barrel
A. This is to give a water pressure head against foaming when the
generator is in action. About 15 lb. of lime should be well mixed
with the water in the barrel B. All
[Illustration: FIG. 5; The Hydrogen Generator]
joints must be sealed with plaster of Paris. Pour in one-half of
the acid into the barrel, A, with the iron borings. The barrels
are kept tight while the generation is going on with the exception
of the outlet, C, to the bag. When the action is stopped in the
generator barrel, A, let the solution run out and fill again as
before with water and acid on the iron borings. The outlet, C,
should be always connected with the bag while the generator is in
action.
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