Proceedings of the American Academy of Arts and Sciences, Volumen7Metcalf and Company, 1868 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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Página 52
... sides of a hard rubber ring ; the length being accurately meas- ured by multiplying the dimensions of the ring where wound upon by the number of revolutions per minute , and this product by the number of minutes of actual winding . This ...
... sides of a hard rubber ring ; the length being accurately meas- ured by multiplying the dimensions of the ring where wound upon by the number of revolutions per minute , and this product by the number of minutes of actual winding . This ...
Página 56
... side of a leaf by a strong silken cocoon of loose texture , and varying in color . Many of the eggs which were laid by my spiders in September were hatched in about thirty days . The young differ much from the adult in form and color ...
... side of a leaf by a strong silken cocoon of loose texture , and varying in color . Many of the eggs which were laid by my spiders in September were hatched in about thirty days . The young differ much from the adult in form and color ...
Página 58
... side of my laboratory was 70 ° F. , while the wet - bulb thermometer indicated 66 ° , showing an amount of moisture in the atmosphere equal to 6.57 grains per cubic foot . At the same time the atmosphere was beautifully clear , and the ...
... side of my laboratory was 70 ° F. , while the wet - bulb thermometer indicated 66 ° , showing an amount of moisture in the atmosphere equal to 6.57 grains per cubic foot . At the same time the atmosphere was beautifully clear , and the ...
Página 59
... side of Fig . 4 only serves to indicate its position and approximate breadth . The 26th of December was also a warm day for the season , with a brilliant sun . At one o'clock , P. M. , the dry - bulb thermometer marked 55 ° , the wet ...
... side of Fig . 4 only serves to indicate its position and approximate breadth . The 26th of December was also a warm day for the season , with a brilliant sun . At one o'clock , P. M. , the dry - bulb thermometer marked 55 ° , the wet ...
Página 64
... side of the D line , and in which during dry weather only a comparatively few lines can be distinguished , was then as thickly crowded with lines as the blue or the violet , but the lines were of course far less intense . Professor ...
... side of the D line , and in which during dry weather only a comparatively few lines can be distinguished , was then as thickly crowded with lines as the blue or the violet , but the lines were of course far less intense . Professor ...
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Página 38 - ... cylinders, welded together endwise. Each ring was made of bars wound upon an arbor spirally, like winding a ribbon upon a block, and, being welded and shaped in dies, were joined endwise, when in the furnace and at a welding heat, and afterwards pressed together in a mould, by a hydrostatic press of 1,000 tons force.