Philosophical Magazine

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Taylor & Francis., 1885 - Physics

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Page 270 - October 2, 1879, expresses his continued adherence to the opinion "that the atolls and barrier reefs in the middle of the Pacific and Indian Oceans indicate subsidence" ; and the letter of my friend Professor Judd, printed at the end of this article (which I had perhaps better say Professor Judd had not seen) will prove that this opinion remained unaltered to the end of his life.
Page 282 - Tuscorora" and "Challenger" have made known numerous submarine elevations : mountains rising from the general level of the ocean's bed, at a depth of 2500 or 3000 fathoms, up to within a few hundred fathoms of the surface.
Page 274 - ... (4.) That barrier reefs have built out from the shore on a foundation of volcanic debris or on a talus of coral blocks, coral sediment, and Pelagic shells, and the lagoon channel is formed in the same way as a lagoon. (5.) That it is not necessary to call in subsidence to explain any of the characteristic features of barrier reefs or atolls, and that all these features would exist alike in areas of slow elevation, of rest, or of slow subsidence. In conclusion it was pointed out that all the causes...
Page 343 - Commission, when it ordered the killing of the "wild well." The object of the present paper is to give an account of the...
Page 73 - After discussing the origin of Coal-beds, and the causes of their variation in structure and quality, the author proceeded to describe the North Wales and Shrewsbury Coal-field, which consists of three parts: — (1) The Shrewsbury field south of the Severn, exclusively composed of Upper Coal-measures ; (2) the tracts north of the Severn, extending from near Oswestry to north of Wrexham ; and (3) the Flintshire Coal-field. The first and second are separated from each other by the alluvial plain of...
Page 179 - ... we shall have, in passing from the outside to the centre, a series of strata in a more and more perfect crystalline condition. Light, as we know in the case of some bodies, tends to promote crystallization, and, when it falls on the surface of such a stick of selenium, probably tends to promote crystallization in the exterior layers, and therefore to produce a flow of energy from within outwards, which under certain circumstances appears, in the case of selenium, to produce an electric current....
Page 350 - Thus we may collect the results as below. TABLE IV. Thus there is a difference of '0005 legal ohm between the two. My results are based upon the value of the resistance of mercury in terms of the BA unit adopted by the BritishAssociation Committee. If we denote by M the resistance at 0° C. of a column of mercury 1 metre long, 1 square millim. in section, then, according to the number adopted by the Committee> M.
Page 475 - ... until a sufficient supply has been obtained from below, when the surface rises and wets the sand again. On raising the foot it is generally seen that the sand under the foot and around becomes momentarily wet ; this is because, on the distorting forces being removed, the sand again contracts, and the excess of water finds momentary relief at the surface.
Page 51 - Iť one of a series of well-known papers (Pogg. Annal. vol. cxxxix. part 1 ; and Phil. Mag. April 1871) Prof. Quincke has recorded a large number of measures of flat drops and bubbles, from which he has deduced the value of the tensions, not only at the free surface of liquids, but also at the common surface of two liquids in contact. The numerical results obtained exceed very appreciably the values of the surface-tensions deduced from observations with capillary tubes, and Prof. Quincke attributes...
Page 470 - I have called this unique property of granular masses " dilatancy," because the property consists in a definite change of bulk, consequent on a definite change of shape or distortional strain, any disturbance whatever causing a change of volume and generally dilatation.

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