It is now necessary to varnish the bag in order to make it retain
the gas. Procure 1 gal. of the very best heavy body, boiled
linseed oil and immerse the bag in it. The surplus oil is squeezed
out by running the bag through an ordinary clothes wringer several
times. The bag is now placed in the sun for a thorough drying. Put
the remaining oil in a kettle with 1/8 lb. of beeswax and boil
well together. This solution is afterward diluted with turpentine
so it will work well. When the bag is dry apply this mixture by
rubbing it on the bag with a piece of flannel. Repeat this
operation four times,
[Illustration: Sewing Segments Together]
being sure of a thorough drying in the sun each time. For indoor
coating and drying use a small amount of plumbic oxide. This will
dry rapidly in the shade and will not make the oil hard.
Fill the bag with air by using a pair of bellows and leave it over
night. This test will show if the bag is airtight. If it is not
tight then the bag needs another rubbing. The next operation is to
fill the bag with gas.
Hydrogen gas is made from iron and sulphuric acid.
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