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 + ẞ x2 + xy2 + 8 z2 = 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 + ẞ x2 + xy2 + 8 z2 = 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 DÑ1 U1⋅ DÑ2 U1⁄2 • cos a1 X1 X2 2 COS a2 ...
... 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 DÑ1 U1⋅ DÑ2 U1⁄2 • cos a1 X1 X2 2 COS a2 ...
Página 42
... common tangent of circles x2 + y2 = 1 , x2 + y2 = 4 , found thus , x cos ay sin a = x cos ay sina = ... cos a = ∞ , ་ ང 2 , 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 , x2 + y2 = 4 , found thus , x cos ay sin a = x cos ay sina = ... cos a = ∞ , ་ ང 2 , make in like manner such angles with itself as the circles make with each other's ordinary tangents , namely ...
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Página 47 - ... 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.