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Updated: September 9, 2025
But up aloft, here, the speed and direction of the air-currents are so uncertain that it is impossible to take them into one's calculations; hence it becomes necessary to check one's reckoning by means of frequent observations." "Do you think that any of the people in those ships down there will see us?" asked Feodorovna.
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.
With the Bruce telescope, a photographic doublet 24 inches in diameter, a store of 5,686 negatives was collected at Arequipa between 1896 and 1901. Some were exposed directly, others with the intervention of a prism; and all are available for important purposes of detection or investigation. Vapours and air-currents do not alone embarrass the use of giant telescopes.
The air-currents flicked the desert with their freight of swift-moving shadows, causing strange movement among the bits of wreckage the cattle. It was a glorious march, lighting up the western expanse beneath and revealing a flat country, unbroken by dune or cleft as far as the eye could penetrate. So the light moved on, crowding before it sullen shadows which presently disappeared.
But even then other conditions are likely to arise, such as air-currents, which may swing the missile to one side of the objective. Consequently adequate allowance has to be made for windage, which is a very difficult factor to calculate from aloft. Bomb-dropping from an aeroplane is even more difficult.
Accordingly, the airman has to release the bomb before he reaches the target below. The determination of the critical moment for the release is not easy, inasmuch as the airman has to take into his calculations the speed of his machine, his altitude, and the direction and velocity of the air-currents.
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