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 38
... fact hardly sensible . The next step is to derive the right - ascensions of other polar stars from that of Polaris ; and it is here necessary to observe at two opposite seasons of the year , or , which is the same thing , at two oppo ...
... fact hardly sensible . The next step is to derive the right - ascensions of other polar stars from that of Polaris ; and it is here necessary to observe at two opposite seasons of the year , or , which is the same thing , at two oppo ...
Página 43
... fact that homofocals envelop homofocals , a familiar case is that each focal line of a cone U touches either co - planar focal of any enveloped quadric V ; whence the circularity of that enveloping cone . whose vertex is on a focal ...
... fact that homofocals envelop homofocals , a familiar case is that each focal line of a cone U touches either co - planar focal of any enveloped quadric V ; whence the circularity of that enveloping cone . whose vertex is on a focal ...
Página 46
... fact that the two are found combined in nearly all the modern built - up guns . The first initiated a system of construction which may be designated as the coil system ; the second , what may be named the hoop system . The first was ...
... fact that the two are found combined in nearly all the modern built - up guns . The first initiated a system of construction which may be designated as the coil system ; the second , what may be named the hoop system . The first was ...
Página 50
... fact , a principal cause of the failure of so great a part of the large guns of Blakely and Parrott , Pro- fessor Treadwell , as the principal result of this third investigation , pro- ceeds to show , that , to attain with effect the ...
... fact , a principal cause of the failure of so great a part of the large guns of Blakely and Parrott , Pro- fessor Treadwell , as the principal result of this third investigation , pro- ceeds to show , that , to attain with effect the ...
Página 54
... facts , but which , so far as I know , has never before been observed , this spider not only has the power of regulating the size of its thread , according as one or two , or three or four of its spinnerets are pressed upon the surface ...
... facts , but which , so far as I know , has never before been observed , this spider not only has the power of regulating the size of its thread , according as one or two , or three or four of its spinnerets are pressed upon the surface ...
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Pasajes populares
Página 130 - The Vegetable Kingdom, or the Structure, Classification, and Uses of Plants, illustrated upon the Natural System.
Página 496 - Two reports have recently been issued on rates of deck watches and of box and pocket chronometers on trial for purchase by the Board of Admiralty at the Royal Observatory, Greenwich, in the latter half of last year.
Página 16 - Report of the Astronomer Royal to the Board of Visitors of the Royal Observatory, Greenwich, read at the Annual Visitation of the Royal Observatory, 1860, June 2; and Address of the Astronomer Royal to the Board of Visitors, 1860, May 12.
Página 26 - 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.
Página 28 - An address delivered at the anniversary meeting of the Geological Society of London, on the 19th of February, 1841 ; and the announcement of the award of the Wollaston medal and donation fund for the same year.
Página 507 - ANNUAIRE DE CHIMIE, comprenant les applications de cette science à la médecine et à la pharmacie, ou Répertoire des découvertes et des nouveaux travaux en chimie faits dans les diverses parties de l'Europe ; par MM. E.
Página 311 - THE GEOLOGY OF PENNSYLVANIA: A Government Survey ; with a General View of the Geology of the United States, Essays on the Coal- Formation and its Fossils, and a Description of the Coal-Fields of North America and Great Britain.
Página 13 - Report to the Legislature of Massachusetts relating to the Registry and Return of Births, Marriages and Deaths in the Commonwealth for the year ending December 31, 1880.
Página 14 - 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 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.