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...cu...
...containing no carbon monoxide because manufactured at low temperatures. The product's qualities : non-asphyxiating because void of carbon monoxide ; content of 1,600 British thermal (heat) units as against 525 to 585 units in most illuminating gases. From 7 gal. of refinery residuum are produced 1,000 cu. ft. of the new gas and a by-product of 1½ gal. of gasoline high in ethylene content (40% to 50%). The inventor: one Dr. O. U. Bean, inventor also of the Bunsen furnace...
Dreadnoughts then superdread-noughts; airships, now superairships. The Shenandoah and the ZR3 with their 2,00,000 cu. ft. of gas or so, their lifting capacity of 150,000 Ib. will soon appear small and insignificant. Airships improve with size; the larger they are, the faster they can go and the greater the proportion of commercial load they can carry relative to their gross weight. Accordingly, the Good-year-Zeppelin Co. is planning on a 5,000,000 cu. ft. ship and the British are actually starting work on two ships of equal size...
Granted that a ship twice as big as the ZR-3 can be built for $1.00 per cu. ft., costing, therefore, bettween four and five million dollars, it will be comparable in price with a steamer and yet have a passenger capacity of only...
Helium is said to cost $40 per 1,000 cu. ft. In reality, it costs the Government very nearly $160 per 1,000 cu. ft.; and, since only 1% of helium is present in the most richly endowed sources of natural gas, it must always be expensive. In the Atlantic crossing, the ZR3 used up 30% of its hydrogen. Even with recovery of the gases in the exhaust to compensate for loss of weight by fuel, thus dispensing with the "valving" of gas to meet changes in weight, there will always be a large expenditure of helium...