The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1911 - English periodicals |
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Common terms and phrases
absorption acetic acetic acid acid actinium alcohol alpha rays aluminium amperes apparatus atomic weight axis bulb calculated carbon cathode cent centimetre charge coefficient coil column constant corresponding curve deflexion delta rays density determined dielectric dihydrol distance effect electric electromotive force electrons electroscope emanation emission emitted energy equation equilibrium experimental experiments fluorescent force formic acid formula gases given gives grating heat helium hydrogen hydrol increase investigation ionization J. J. Thomson light lines liquid maximum mean measured mercury metal method millimetres molecular molecules motion negative observed obtained orbit p₁ paper particles Phil plate platinum polarization polonium positive ions potential pressure quantity radiation radioactive radium ratio rays reflexion salt shown solution spectra spectrum sphere substance surface temperature theory thorium trihydrol tube uranium vapour velocity viscosity volts wave-length wire
Popular passages
Page 805 - Nature does nothing in vain, and more is in vain when less will serve, for Nature is pleased with simplicity, and affects not the pomp of superfluous causes." I
Page 805 - that, '• we are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances ; for Nature
Page 257 - to give light vibrating in a plane inclined at an angle of 45° to the plane of incidence, the displaced position of the central fringe was observed (again as the mean of at least twelve settings from each direction), and the position of the
Page 128 - is controlled by three adjustment screws (horizontal and vertical axes of rotation), to secure complete parallelism of the faces of the grating. Each, moreover, may be rotated around a horizontal axis to place the lines parallel to the slit of the collimator. The duplex grating is mounted on a spectrometer as is usual for
Page 643 - per year) referred to earlier, and confirms in a striking way the conclusions on which the calculations were based. There can be no doubt that the a. particle during its flight consists of a helium atom carrying two unit positive charges, and that helium itself is
Page 386 - of erosion. Igneous rocks are abundantly present, but for the most part are subordinate in amount to the sediments. The Archaean is characterized mainly by igneous rocks with the sediments in very small quantity. The Archaean sediments, moreover, are frequently of ' wacke' type, and, so far as known, are not largely of the
Page 125 - interfere in the line D. To make the adjustment it is sufficient to bring the Fraunhofer lines in the two spectra seen at E into complete coincidence, horizontally and vertically. Coincidence of slit images at R (at least vertically) aids in the same result. It is also necessary that the rulings on
Page 129 - must be to the rear of g and the airspace e is throughout negative. If this is now decreased numerically the lines travel through the spectrum in the opposite direction to the preceding case, while at the same time they coarsen until they vanish as a whole, as before. The grating
Page 140 - employed and their mean values. To find the mean width of fringes between these lines, their angular deviations were divided by the number of fringes counted between them at different values of e. The results agree as closely as the difficulty of the observations warrants. One may note that without removing N, the corresponding coefficients would be