Collection Items
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Manuscript/Mixed MaterialImage 1 of Article by Alexander Graham Bell, undated Rough Draft UPON THE TETRAHEDRAL PRINCIPLE IN KITE CONSTRUCTION. A few years ago I made a communication to the Academy upon the subject of “Radial-Winged Kites”; and some of the photographs shown...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 2 of Article by Alexander Graham Bell, undated 2 In my younger days the word “Kite” suggested a structure of wood in the form of a cross covered with paper —making a diamond-shape surface longer one way than the other...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 3 of Article by Alexander Graham Bell, undated 3 in kite structure have been seriously considered, and the recent developments in this art have been mainly due to one man, Mr. Laurence Hargrave of {Begin deleted text}New South Wales{End deleted...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 4 of Article by Alexander Graham Bell, undated 4 steam vessels so as to secure a continuous line of observation s all the way across the Atlantic. Hargrave introduced what is known as the cellular construction of kite. H e...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 5 of Article by Alexander Graham Bell, undated 5 In the above drawing of a Hargrave box kite I have shown only necessary details — with only sufficient framework to hold the cells together. It is obvious that such a...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 6 of Article by Alexander Graham Bell, undated 6 This internal bracing — even if made of the finest wire so as to be insignificant in weight — all comes in the way of the wind, increasing the head resistance...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 7 of Article by Alexander Graham Bell, undated 7 power to Hargrave's four-sided rectangular cell — practically there is no substantial difference. So far as I can judge from observation in the field, kites constructed on the same general model...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 8 of Article by Alexander Graham Bell, undated 8 advantage for the two, so that in this case the weight of the compound kite may be less than the sum of the weights of the component kites, while the surface...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 9 of Article by Alexander Graham Bell, undated 9 He shows that where two flying machines — or I may add kites — are “ exactly alike ” differing only in the scale of their dimensions, {Begin deleted text} {End...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 10 of Article by Alexander Graham Bell, undated 10 as light a breeze as the smaller kites of which they are compounded. While kites with triangular cells are structurally strong in a transverse direction, they are structurally weak in the...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 11 of Article by Alexander Graham Bell, undated 11 tetrahedron is produced by joining together six equal rods end to end so as to form four equilateral triangles. One of the common puzzles for the amusement of children, — and...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 12 of Article by Alexander Graham Bell, undated 12 It is astonishing how solid such a framework appears even when composed even of very light and fragile material; and compound structures formed by fastening these tetrahedral frames together at the...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 13 of Article by Alexander Graham Bell, undated 13 raised in a similar manner so that we have learnt by experience to respect the lifting powers of these kites; and further experiments with them have been postponed until the trials...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 14 of Article by Alexander Graham Bell, undated 14 Each tetrahedral cell is covered on two of its sides by silk, thus carrying two triangular aeroplanes at an angle of sixty degrees to one another, so that when it is...
- Contributor: Bell, Alexander Graham
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Manuscript/Mixed MaterialImage 15 of Article by Alexander Graham Bell, undated 15 This kite also flies very steadily when flown by a cord attached to the bow and when the position of the cord is shifted along the keel towards the center of...
- Contributor: Bell, Alexander Graham