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Its total non-combustibility makes it poHHihlc* to build a dirigible balloon more compactly hee^use fear of sparks from the motor is remove*I. It has \**vn NUggeHted that it would lm possible to mount a machine gun on the top of the ga# bug. In order to decrease the vtmlf it has been proponed to put helium into the compartment* which an4 <*xponed and hydrogen into other compnrtmentH. ' In n tml flight early in Deci*iiil«*r, 15)21, thi» U. 8. nnviil airnhip O 7 demormtratiHl the pnicticability fif helium-filled dirigible«.

The question of storage for such a quantity of gas becomes a serious problem. The cost is said to be less than 10 cents per cubic foot, with the prospect of a decrease to 5 or even 2 cents per cubic foot. Recent tests at the cryogenic laboratory in Washington indicate that it is possible to produce reasonably pure helium from natural gas by a single operation, thus materially reducing the cost. Canadian supplies 3 were tested by experimental plants at Hamilton, Ontario, and Calgary, Alberta. 33 per cent.

Altitudes as great as 3£ miles have failed to show 2 any material change in the quantity of argon present. The fact that argon is more soluble in water than is nitrogen accounts for the fact that the proportion of argon in dissolved gas is greater than in air; it also probably accounts for the fact that argon is found in plants and in the blood of animals. 5 per cent. I t is found in certain samples of natural gas, and a few minerals, mainly zirconium ores, yield argon when heated. The atmosphere is supposed to be the original source of argon in nearly all cases.

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Chemistry of the Rarer Elements by B. S Hopkins

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