Aerial Navigation of Today: A Popular Account of the Evolution of AeronauticsSeeley, 1910 - 326 strán (strany) Beskriver flyvningens historie og udvikling op til ca. 1910. |
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40 miles aerial craft aerial navigation aero aeronaut aeroplane airship altitude angle apparatus ascend atmosphere aviator ballast ballonnet balloonist biplane birds Bolak box-kite captive balloons carry Chanute CHAPTER Chatham Dockyard Clément-Bayard cloth clouds coal gas course cubic feet curve degrees descending DIAGRAM direction dirigible balloon distance driven earth effect electric elevator engine entering edge envelope equilibrium experiments Extra Crown 8vo Fahrenheit feet in diameter feet long flying flying-machine France front gas-container gas-envelope gliding ground Henry Giffard horizontal plane hydrogen Illustrations increased kite land large number leather lifting lifting-power main planes means mechanical flight miles an hour miles per hour military monoplane motor movement moving necessary nett observations ordinary possible pounds propellers rear rigid rudder side soaring speed spherical balloon square feet stability steering Super-royal 8vo surface tail temperature tilt upward various velocity vertical rudder voyage weight Wilbur Wright wind wings Wright machine Zeppelin
Populárne pasáže
Strana 163 - When the condors are wheeling in a flock round and round any spot, their flight is beautiful. Except when rising from the ground, I do not recollect ever having seen one of these birds flap its wings.
Strana 325 - Prom cover to cover the book is readable, and every word is intelligible to the layman. Dr. Dolmage displays literary powers of a very high order. Those who read it without any previous knowledge of astronomy will find that a new interest has been added to their lives, and that in a matter of 350 pages they have gained a true conception of the meaning of astronomy.
Strana 325 - The Standard. ELECTRICITY OF TO-DAY. Its Work and Mysteries Explained. By CHARLES R. GIRSON, FRSE " Mr. Oibson has given us one of the best examples of popular scientific exposition that we remember seeing.
Strana 163 - Except when rising from the ground, I do not recollect ever having seen one of these birds flap its wings. Near Lima, I watched several for nearly half an hour, without once taking off my eyes.
Strana 163 - As they glided close over my head, I intently watched from an oblique position, the outlines of the separate and great terminal feathers of each wing ; and these separate feathers, if there had been the least vibratory movement, would have appeared as if blended together ; but they were seen distinct against the blue sky.
Strana 336 - The Golden Humorous Reciter. Edited, and with a Practical Introduction, by CAIRNS JAMES, Professor of Elocution at the Royal College of Music and the Guildhall School of Music. A volume of Recitations and Readings selected from the writings of F.
Strana 20 - He described the construction of an aerial machine, " which," he wrote, " must be a large hollow globe of copper, or other suitable metal, wrought extremely thin, in order to have it as light as possible. It must then," he continued, " be filled with 'ethereal air or liquid fire,' and then launched from some elevated point into the atmosphere, where it will float like a vessel on water.
Strana 116 - ... 4. That with similar conditions large surfaces may be controlled with not much greater difficulty than small ones, if the control is effected by manipulation of the surfaces themselves, rather than by a movement of the body of the operator. ' 5. That the head resistances of the framing can be brought to a point much below that usually estimated as necessary. ' 6. That tails, both vertical and horizontal, may with safety be eliminated in gliding and other flying experiments.
Strana 116 - That in arched surfaces the centre of pressure at 90 degrees is near the centre of the surface, but moves slowly forward as the angle becomes less, till a critical angle varying with the shape and depth of the curve is reached, after which it moves rapidly toward the rear till the angle of no lift is found.
Strana 331 - CHORAL SERVICE-BOOK FOR PARISH CHURCHES, THE. Compiled and Edited by JW ELLIOTT, Organist and Choirmaster of St. Mark's, Hamilton Terrace, London. With some Practical Counsels taken by permission from " Notes on the Church Service,