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 28
... common Epoch , 1860.0 ( with Precessions computed from the Epoch 1860.0 ) . [ From the Philos . Trans . Part I. 1864. ] 4to pamph . London . 1864 . Prof. A. C. Ramsay , F. R. S. , & c . Address delivered at the Anniversary Meeting of ...
... common Epoch , 1860.0 ( with Precessions computed from the Epoch 1860.0 ) . [ From the Philos . Trans . Part I. 1864. ] 4to pamph . London . 1864 . Prof. A. C. Ramsay , F. R. S. , & c . Address delivered at the Anniversary Meeting of ...
Página 39
... common auto- polar tetrahedron , T. Referred to this their equations become U a w2 + bx2 + cy2 + dz2 = 0 , = Y = a w2 + ẞx2 + vy2 + 8z2 = 0 , whether in tangential or in point - coördinates . Using tangential coördi- nates , all the ...
... common auto- polar tetrahedron , T. Referred to this their equations become U a w2 + bx2 + cy2 + dz2 = 0 , = Y = a w2 + ẞx2 + vy2 + 8z2 = 0 , whether in tangential or in point - coördinates . Using tangential coördi- nates , all the ...
Página 40
... common tangent - planes to those sur- faces then differ not sensibly from the cone's tangent - planes , and hence envelop the circle . Hence , as Salmon shows , a quadric's three focal curves , with the spherical curve at infinity , are ...
... common tangent - planes to those sur- faces then differ not sensibly from the cone's tangent - planes , and hence envelop the circle . Hence , as Salmon shows , a quadric's three focal curves , with the spherical curve at infinity , are ...
Página 41
... common developable ; but it fails for the envelope's rays ; for since every tangent - plane from a finitely - near point to the circle at infinity has some infinite direction - cosines , while X1 X2 • Dε1 U1 DN2 U1⁄2 • cos a1 cos aq = 9 ...
... common developable ; but it fails for the envelope's rays ; for since every tangent - plane from a finitely - near point to the circle at infinity has some infinite direction - cosines , while X1 X2 • Dε1 U1 DN2 U1⁄2 • cos a1 cos aq = 9 ...
Página 42
... common tangent of circles - x2 + y2 = 1 , found thus , x cos ay sin a = x2 + y2 = 4 , x cos ay sin a = 2 , ..cos a ∞ , 1 , make in like manner such angles with itself as the circles make with each other's ordinary tangents , namely ...
... common tangent of circles - x2 + y2 = 1 , found thus , x cos ay sin a = x2 + y2 = 4 , x cos ay sin a = 2 , ..cos a ∞ , 1 , make in like manner such angles with itself as the circles make with each other's ordinary tangents , namely ...
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Página 17 - Statistics of the Foreign and Domestic Commerce of the United States. .... Communicated by the Secretary of the Treasury, in Answer to a Resolution of the Senate of the United States, March 12, 1863.
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Página 443 - The relationship of punalua is rather amphibious. It arose from the fact that two or more brothers with their wives, or two or more sisters with their husbands, were inclined to possess each other in common ; but the modern use of the word is that of dear friend or intimate companion."1 The Rev.
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Página 7 - Annual Report of the Trustees of the Museum of Comparative Zoology at Harvard College, in Cambridge, together with the Report of the Director, 1864.
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.