By Alfred W. Lawson
Первый том авиационной энциклопедии, издававшейся с марта 1910 г.
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Alexander, as well as the East He London College. thinks that within three years' time at least fifteen thousand boys of England ahead of that country theoretically. " lighter-than-air be discarded for the propelling force of flying machines and the will be able to fly : in fact, he is of the opinion that boj'S will take the greatest part in the development of the science, they having more time to devote to getting into smash-ups than men it and less fear of usually. Mr. Alexander thinks that the movement has now taken root in the United States, and that this country within the next three years will rank among the great aeronautical centers of the world.
5,600 Oflice. m. No. IV.. 1,200 m. Aero Club 3, 3 speed the auspices of the Military No. per hour. , 5,500 m. 200 m. 3. speed 24 miles per hour. "Rigid type": Zeppelin No. , 13,000 m. , speed 24 miles an hour. War Oflice. Zeppelin No. , 15,000 m. 3, speed 28 miles an hour. -War Office. Zeppelin No. , 15,000 m. 3, speed 33 miles per hour. "Non-rigid type. Unde nstruction "; Siemens-Schuckert, 13,000 m. 3" Rigid type ": Sehnette, 20,c Belongs 3. the to German Aerial Navigatic. _„. "In preparation": Unger.
On account of the diminished density of the air at this elevation, however, the pressure of the wind becomes only one-quarter of that for the of measuring wind velocity within the stratum is increase in said, it in winter at velocity at sea-level. The wind is also of inground the highest velocity occurs in the after- diurnal change in the velocity of the At terest. the noon and the lowest wind velocity with height above the ground is found from these records to be very rapid. At night it is faster and attains a maximum at the height of a third of a mile, above which there is a decrease in velocity, except in winter, up to twothirds of a mile.