Philosophical MagazineTaylor & Francis., 1891 - Physics |
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Common terms and phrases
action æther allotropic silver amplitude angle of incidence aperture atomic axis calculated cell cent centim centimetres chemical chloride circuit coefficient coil colour condenser conductivity conductor constant curve deflexion determined dielectric dielectric constant dissolved distance earths effect electricity electrodes electrolyte electromotive force electrostatic induction elements equation experiments film formula galvanometer given gives glass heat hydrochloric acid increase insulated iodine J. J. Thomson length light lines liquid magnetic force means measured metal method mirror molecular molecules NaCl needle negative Nicol prisms observed obtained oscillations oxide paper parallel Phil piezometer placed plane of incidence plate platinum polarization positive potassium ferricyanide potential pressure prisms produced Prof quantity resistance rotation salts selenium sensitive solubility spectra spectrum substance sulphuric surface Table temperature thickness tion tubes of electrostatic velocity vibration wave-length wire yttria zinc
Popular passages
Page 89 - and with an increased apparent magnitude, the name of a telescope can hardly be denied to it. “As the minimum focal length increases with the square of the aperture, a quite impracticable distance would be required to rival the resolving power of a modern telescope. Even for an aperture of four inches
Page 85 - will be the correct summation only, if the series can be broken up into a small number of separate series for each of which the value of a term is either smaller or greater than the arithmetical mean of the terms between which it stands, so that the sum of all such values
Page 70 - A. Geikie, FRS, President, in the Chair. The following communications were read :— 1. “On some Waterworn and Pebbleworn Stones taken from the Apron of the Severn Commissioners' Weir erected across the River at Holt Fleet about
Page 184 - beyond which the theory in question will not apply. “For unless the breadth of the bar (or diameter perpendicular to the plane of flexure) be very small in comparison with the mean proportional between the radius
Page 185 - and so vitiate the solution. Unhappily, mathematicians have not hitherto succeeded in solving, possibly not even tried to solve, the beautiful problem thus presented by the flexure of a broad very thin band (such as a watchspring) into a circle of radius comparable with a third proportional to its thickness and its breadth.” The difficulty thus arising in the case of a straight band, when the
Page 89 - f¿= 800. The image of the sun thrown on a screen at a distance exceeding 66 feet, through a hole .¿ inch in diameter, is therefore at least as well defined as that seen direct. In practice it would be better defined, as the direct image is far from perfect. If the image on the screen be regarded from a distance
Page 69 - As the result of movements in the Earth's crust, the Morte Slates have been brought to the surface and thrust over much newer rocks, producing a deceptive appearance of overlying the latter conformably. The Morte Slates mark the dividing line between the two main troughs. On the north side in ascending order are the Hangman (or Lynton),
Page 470 - has been estimated by competent geologists at from 8 to 10 miles. The bulk of the rocks, as judged by their constitution, are usually considered by geologists to largely indicate either a moderate depth of water or actual shallow conditions. These rocks are intercalated with others exhibiting signs of a more oceanic origin. All the
Page 33 - are times, supposing that the times consumed in making each triplet of observations are equal and similar. The oscillations are due to the fact that pressure is raised from about 150 atmospheres to about 600 atmospheres, and then lowered to the first value again, thus giving the three points for eac¿h of the triplets numbered.
Page 26 - has partially, anticipated me, stating that strain more or less completely converts cold metals from one definite molecular condition into another. I have been unable to find, however, that Osmond has any direct evidence to support this assertion, and I have already pointed out ¿ some of the difficulties which