A Treatise Upon the Art of Flying: By Mechanical Means, with a Full Explanation of the Natural Principles by which Birds are Enabled to Fly; Likewise Instructions and Plans for Making a Flying Car with Wings, in which a Man May Sit, And, by Working a Small Lever, Cause Himself to Ascend and Soar Through the Air with the Facility of a Bird ...J. Simmons, and sold by Longman, Hurst, Rees, & Orme, London, 1810 - 67 pàgines |
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Resultats 1 - 5 de 10.
Pàgina 9
... condor ; also , the different expansion of the wings . I shall compare the weight of a man with the weight of the condor , and there- by determine the necessary dimensions of a pair of wings which would enable a man to fly ; and lastly ...
... condor ; also , the different expansion of the wings . I shall compare the weight of a man with the weight of the condor , and there- by determine the necessary dimensions of a pair of wings which would enable a man to fly ; and lastly ...
Pàgina 17
... condor , for the information of such of my readers as may not be acquainted with it . The condor is a native of America , and hitherto naturalists have been divided whether to refer it to the species of the eagle , or to that of the ...
... condor , for the information of such of my readers as may not be acquainted with it . The condor is a native of America , and hitherto naturalists have been divided whether to refer it to the species of the eagle , or to that of the ...
Pàgina 18
... condor possesses , in a higher degree than the eagle , all the qua- lities that render it formidable , not only to the feathered tribe , but to beasts , and even to man himself . Acosta , Garcilasso , and Desmarchais assert , that it ...
... condor possesses , in a higher degree than the eagle , all the qua- lities that render it formidable , not only to the feathered tribe , but to beasts , and even to man himself . Acosta , Garcilasso , and Desmarchais assert , that it ...
Pàgina 20
... condor perched on a high rock , before me ; I approached within gun - shot and fired ; but , as my piece was only charged with swan - shot , the lead was not heavy enough to bring the bird down . I perceived , however , ; by its manner ...
... condor perched on a high rock , before me ; I approached within gun - shot and fired ; but , as my piece was only charged with swan - shot , the lead was not heavy enough to bring the bird down . I perceived , however , ; by its manner ...
Pàgina 22
... condor to continue there but a short time . They usually come to the coast at the approach of evening , stay there all night , and fly back in the morning . " I now proceed to describe the construction and application of the wings of a ...
... condor to continue there but a short time . They usually come to the coast at the approach of evening , stay there all night , and fly back in the morning . " I now proceed to describe the construction and application of the wings of a ...
Altres edicions - Mostra-ho tot
A Treatise Upon Aerostation: Or, The Art of Travelling Through the Air, by ... Thomas Walker Visualització completa - 1831 |
Frases i termes més freqüents
able to fly angle art of flying artificial flying artificial wings ascend back edges back rib body buoyancy and progression cause centre of gravity class of birds compressed condor cords cross bar demonstrate dimensions dity drachm eagle effect eighteen inches elastic power exertion expansion of wings experiment fastened fixed Flamborough flight of birds flying by mechanical fore ribs formed forward give grebe humming bird humming-bird impels impulse inches long invention JOSEPH SIMMONS lever living machine lordship manner of flying means of flying middle rib motion of birds oblique observe pair of wings paper wings parachute pectoral muscles perpendicular line pigeon principles projectile force projectile motion proportion quill feathers reaction readers sail science of flying shafts shew side rails silk slips steerage stone strength strike the wings subject of flying sufficient three feet tion treatise underside and back Vide plate whole weight wings and tail wings large
Passatges populars
Pàgina 7 - There be three things which are too wonderful for me, yea, four which I know not: The way of an eagle in the air; the way of a serpent upon a rock; the way of a ship in the midst of the sea; and the way of a man with a maid.
Pàgina 14 - ... fastened to him, leaving the whole weight of his body unsupported. Friar Bacon, who lived nearly five centuries ago, wrote upon the subject, and he affirms that the art of flying is possible ; and many others have been of opinion that, by means of artificial wings affixed to the arms or legs, a man might fly as well as a bird. The philosophers of the reign of King Charles the Second were much engaged with this art. The famous Bishop Wilkin, who, in 1672, published a treatise upon flying, was...
Pàgina 23 - ... elasticity ; it was expedient too that the quill feathers should separate and open to let the upper air pass through the wings, to facilitate their ascent when they are struck upwards ; it was also necessary that they should all shut close together, forming each wing into a complete surface or web, when they are, by the muscular power of the bird, forced down in order to give a more secure hold upon the air below, and by that means keep the bird up. Now if we do but examine the quill feathers...
Pàgina 36 - ... sufficient to exult in the success of my experiment, which proved to me, in a very satisfactory manner, that what I had conceived to be the cause of the projectile motion of birds was really the cause, and that if I could but give a vertical motion to the wings, so that they might strike upon the air with a sufficient force, they would then increase the reaction of the air, and instead of being projected in an oblique descent, totally overcome their specific gravity, and continue flying in an...
Pàgina 35 - ... as I could, the wings and tail of a bird when expanded in a passive state. I then suspended a small weight from under them, with a piece of thread, exactly in the centre of gravity ; I held them up as high as I could reach, then took away my hand and left them flat upon the air, without giving any impulse to them whatever ; and by the weight pressing downwards the air under the wings became, in some degree, compressed, and by its reaction against the under side and the back edges of the wings,...
Pàgina 40 - ... feet each in length, let them be horizontally expanded, and fastened upon the top edge on each side of the car, with two joints each, so as to admit of a vertical motion to the wings, which motion may be effected by a man sitting and working an upright lever in the middle of the car ; a...
Pàgina 57 - ... similar to what may be observed in the raising of a common paper kite, except in a right angle, or perpendicular line ; but the nearer the angle of ascent inclines to the line of the horizon, the easier will the machine be found to ascend. I believe pigeons can ascend very near in a perpendicular line, but such an ascent would be too incommodious for artificial flying. When...
Pàgina 56 - ... before the car is placed there ; being thus elevated he will have depth enough on each side of the car to admit of his wings striking upon the air. He must then push the lever forward about eighteen inches from its perpendicular line, the tips of the wings will then rise three feet and a half above the level of their joints ; he must then, with a brisk exertion, pull the lever backwards eighteen inches past the perpendicular line, and the tips of the wings will be struck downwards, passing through...
Pàgina 18 - Desmarchais assert that it measures eighteen feet across the wings when expanded ; its beak is so strong as to pierce the body of a cow ; and it is positively asserted that two of them are capable of devouring that animal. They do not even abstain from attacking man himself ; but, fortunately, there are but few of the species.
Pàgina 21 - The great feathers, that were of a beautiful shining black, were two feet four inches long. The thickness of the beak was proportionable to the rest of the body ; the length about four inches ; the point hooked downwards, and white at its extremity ; and the other part was of a jet black.