Aeronautic Instruments. Section VI : Aerial Navigation and Navigating Instruments (1923)
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tter case the difficul- ties involved in taking full account of the motion of the medium are immensely greater. Not only are (he velocities of the winds many limes those of the ocean currents, hut they are ehange- able, varying from day to day, and even from hour to hour. Unlike ships, which are… … Fig. 2.—Drift diagrams. The lack of such information may often add greatly to the time of his flight and, if visibility is poor, he may be swept miles from his course. A historic instance of such an occurrence is that of a fleet of Zeppelins which, after a raid on England on October L9, 1917,…
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