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Soaring strongly even under the additional weight, humming with the rush of air, the plane made the last turn of her spiral and straightened out at the height of twelve hundred feet for her long northward run across the unbroken wilderness. Stern preferred to fly a bit high, believing the air-currents more dependable there.
For the same reason, the burner best suited for light is one in which the jet-openings are proportionately large, so as to prevent as much as possible too great contact with the air in the lower part of the flame. In case the air-currents disturb the light, it is necessary to turn on a stronger flow, which secures steadiness, but sets economy at naught."
Strange air-currents, failure of ignition due to lack of oxygen how do I know? A thousand things may happen in the air." "Not to more than a hundred planes, all in a half-hour." The Frenchman shrugged indifferent shoulders and smiled. "It does not signify, in the least," he murmured. "I am here. That suffices."
The Duke went on to say that he really felt but little hope of ever again seeing, alive, his loved young 'cousin. Then he explained that, whilst there were spots on 'Crater Mountains, from five to eight miles from the central crater, on the far side of the nearer hills, hot enough to roast a large animal, there were other spots on the far side of the remoter mountain ranges where, protected from crater radiation and exposed to antarctic air-currents, the temperature was almost always far below the freezing-point, and sometimes so cold that no animal life, even antarctic animal life, could endure it for an hour.
Lawrence, and generated by the gulf stream in its gyration through the Mexican Bay, being heaped up from the trade wind which causes the oceanic current, and forces its heated atmosphere north and north-east, by the rebound which it takes from the vast Cordilleras of Anahuac and Panama; thus depositing its cooling showers on the chain of the fresh water seas of Canada, condensed as they are by the natural air-currents from the icy regions of the western Andes of Oregon, and the cold breezes from the still more gelid countries of the north-west.
The sand on the borders of the Nile is neither elevated so high by the wind, nor transported by that agency in so great masses, as is popularly supposed; and of that which is actually lifted or rolled and finally deposited by air-currents, a considerable proportion is either calcareous, and, therefore, readily decomposable, or in the state of a very fine dust, and so, in neither case, injurious to the soil.
And when plants have attained maturity and flowered, the flowers employ numberless ways of attracting insects for the purpose of fertilisation. In a still, tropical forest, such as that of Lower Sikkim, there is no hope of the pollen being carried from one flower to another by air-currents. The flowers have therefore to devise a means for the transport of the pollen.
But a willow will grow in baked sand wet with rainwater. An air-plant will grow by feeding on the winds. Nay, those huge forests that overspread great continents have built themselves up mainly from the air-currents with which they are always battling. The oak is but a foliated atmospheric crystal deposited from the aerial ocean that holds the future vegetable world in solution.
"I think it wouldn't do any good whatever. When growing things are broken by the whirlwind, they don't, as a rule, discuss the theory of air-currents as a consolation. Men such as he was take what they desire. It isn't fair to us others. But it's true, for all that " Their eyes met warily; and for no reason which they shared in common they smiled together.
There was also an old sailorman who profited by this recreation of the Hill-dwellers; for he was learned in sails and air-currents, and being deft of hand and cunning, he fashioned the best-flying kites that could be obtained.
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