Ft. Capacity at 68 Fahr.
Gauge Volume Gauge Volume
Pressure Remaining Pressure Remaining
1800 250 700 97
1620 225 500 70
1440 200 300 42
1260 175 100 15
1080 150 18 8
900 125 9 1-1/4
The temperature of the cylinder affects the pressure in a large degree, the
pressure increasing with a rise in temperature and falling with a fall in
temperature. The variation for a 100 cubic foot cylinder at various
temperatures is given in the following tabulation:
At 150 Fahr........................ 2090 pounds.
At 100 Fahr........................ 1912 pounds.
At 80 Fahr........................ 1844 pounds.
At 68 Fahr........................ 1800 pounds.
At 50 Fahr........................ 1736 pounds.
At 32 Fahr........................ 1672 pounds.
At 0 Fahr........................ 1558 pounds.
At -10 Fahr........................ 1522 pounds.
_Chlorate of Potash Method._--In spite of its higher cost and the
inferior gas produced, the chlorate of potash method of producing oxygen is
used to a limited extent when it is impossible to secure the gas in
cylinders.
[Illustration: Figure 8.--Oxygen from Chlorate of Potash]
An iron retort (Figure 8) is arranged to receive about fifteen pounds of
chlorate of potash mixed with three pounds of manganese dioxide, after
which the cylinder is closed with a tight cap, clamped on.
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