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"The old-timers tell me I haven't, but I've seen some terrible storms. Of course the place is unusual " "In what way?" Eliza inquired. "The whole country back of here is ice-capped. This coast for a hundred miles to the east is glacial. The cold air inland and the warm air from the Japanese Current are always at war." "There is a peculiar difference in air-pressures, too," O'Neil explained.
They came up against the problem to which Riach has since devoted so much attention, that of propeller design. 'We had thought of getting the theory of the screw-propeller from the marine engineers, and then, by applying our table of air-pressures to their formulae, of designing air-propellers suitable for our uses.
We had thought of getting the theory of the screw-propeller from the marine engineers, and then, by applying our tables of air-pressures to their formulas, of designing air-propellers suitable for our purpose. But so far as we could learn, the marine engineers possessed only empirical formulas, and the exact action of the screw-propeller, after a century of use, was still very obscure.
Upon trial, however, the lifting capacity again fell very far short of calculation, so that the idea of securing practice while flying as a kite had to be abandoned. Mr. Chanute, who witnessed the experiments, told us that the trouble was not due to poor construction of the machine. We saw only one other explanation that the tables of air-pressures in general use were incorrect.
I could do a good normal three-ninety in this fleet little Wasp, especially if I kept in the rarer air-pressures over the zero-height. The thousand-foot lane had a southward drift, this night. I was making now well over four hundred; I would reach Nareda soon after midnight. The Continental Shelf slid beneath me, dropping away as my course took me further from the Highland borders.
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