• Page 1 of Notes by Alexander Graham Bell, February 21, 1902

    1902, Feb. 21 Friday At 133. Conn. Ave STRIPS 3 MM. THICK Dimensions of strip in mm. 280 × 5 × 3. Weight supported by strip without touching table in grammes as follows: — 240 not 250 gms. White Pine 250 not 260 " Walnut 260 not 270 " 270 not 280 " Cabinet Oak, Quartered Oak 280 not 290 " 290 not 300 ...

    • Contributor: Bell, Alexander Graham
    • Original Format: Manuscripts/Mixed Material
    • Date: 1902-02-21
  • Page 2 of Notes by Alexander Graham Bell, February 21, 1902

    584 41? Thursday touching the table. The differences of stiffness between strips 2mm. thick and 3mm. thick is very remarkable, indicating that with thin strips of this character a very slight change of thickness makes an enormous difference in the resistance to bending. If we take the weights supported by the 2mm. strips and compare them with those supported by similar strips 3mm. thick ...

    • Contributor: Bell, Alexander Graham
    • Original Format: Manuscripts/Mixed Material
    • Date: 1902-02-21
  • Page 3 of Notes by Alexander Graham Bell, February 21, 1902

    585 proportion (probably the cube) it is obvious that it would be advisable in the manufacture of a kite to use the thickest sticks consistant with proper flying weight. I have decided to have some sticks of larger size very carefully made at Ballauf's. The results will probably be less liable to error than those obtained in the case of thinner strips. I adopt ...

    • Contributor: Bell, Alexander Graham
    • Original Format: Manuscripts/Mixed Material
    • Date: 1902-02-21
  • Page 4 of Notes by Alexander Graham Bell, February 21, 1902

    582 The wooden strips mentioned in yesterday's notes, pp. 579 to 581 were made originally under instructions to make them 1⁄8th in. square, but they turned out to be 5mm. square. It is obvious, therefore, that they were not carefully or acurately made. They probably vary slightly in their dimensions and a very slight variation of thickness will make a considerable difference in the ...

    • Contributor: Bell, Alexander Graham
    • Original Format: Manuscripts/Mixed Material
    • Date: 1902-02-21
  • Page 5 of Notes by Alexander Graham Bell, February 21, 1902

    446 Make of Spruce

    • Contributor: Bell, Alexander Graham
    • Original Format: Manuscripts/Mixed Material
    • Date: 1902-02-21