The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1909 - English periodicals |
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Common terms and phrases
absorption acid actinium æther alternating current aluminium anode apparatus atomic atomic weight axis beam benzoic acid bulb calculated carbon cathode celloidin cent centimetres circuit coefficient coil constant curve deflexion density determined diameter diffusion direction disk distance echelon effect electric force electrodes electroscope energy equal equation experimental experiments films formula frequency galvanometer gases given gives glass gram heat hydrogen increase ionization ions iron J. J. Thomson light lines liquid magnetic maximum means measured mercury metal method Methyl formate millimetres molecules motion negative observed obtained paper particles passing Phil plane plate polonium positive potential pressure produced quantity radium ratio rays resistance rotation secondary radiation shown slit solution spectrum striation substances surface Table temperature tertiary radiator theory thickness thorium tube uranium uranyl nitrate vapour velocity vibrations volts wave-length waves wire y-rays
Popular passages
Page 522 - If any force generates a motion, a double force will generate double the motion, a triple force triple the motion, whether that force be impressed altogether and at once or gradually and successively.
Page 522 - DEFINITION II The quantity of motion is the measure of the same, arising from the velocity and quantity of matter conjunctly.
Page 273 - Harcourt pentane lamp, burning at normal barometric pressure (76 cm.) in an atmosphere containing 8 liters of water vapor per cubic meter. In addition to the comparisons of electric and flame standards, carried out recently by the national laboratories in Europe, one comparison was made in 1906, and two in 1908 between the American and European units by means of carefully seasoned...
Page 817 - ... after the late Tertiary uplift, just before glaciers were formed upon the higher-standing monadnocks, the valleys previously eroded among them had presumably been somewhat deepened; but, if one may reason from the case of Dartmoor, the general aspect of the Welsh monadnocks must still have been that of subdued mountains, with dome-like summits and rounded spurs, drained by prevailingly graded streams of accordant levels at their junctions. Some of the larger streams of Wales may have been impelled...
Page 25 - But one of the first, if not the very first desideratum in a complete theory of matter is to explain — first, mass, and second, gravitation. To explain mass may seem an absurd achievement. We generally suppose that it is of the essence of matter to be the receptacle of momentum and energy, and even Thomson, in his definition of hie primitive fluid, attributes to it the possession of moss.
Page 449 - ... weak ; here the ions have not got the minimum amount of energy requisite for them to be luminous when they recombine ; in the bright part of the striation the electric field is strong, and here the ions get sufficient kinetic energy to enable them to give out light when they combine. If the energy required for an ion to give out visible light is greater for light at the blue end of the spectrum than at the red, we might get blue light at one part of the striation, red at another, an effect often...
Page 856 - From a mathematical investigation of the effect of such a body on the rate of growth of radium, it is concluded that it would not, if it existed, appreciably alter the production of radium according to the square of the time over the period accurate observations have been made, even were the period of the new body as great as four years.
Page 738 - Author. already survived many times the average period are considered. What may be termed the inevitableness of the process, and its entire independence of all known conditions, suggests that the cause of disintegration is apart from the atom. It is difficult to believe that the cause is resident in space external to the atom. It seems more probable that it exists within the atom and at the same time is uninfluenced by it. The question about to be discussed is whether necessarily only one mode of...
Page 817 - An excursion around Snowdon in September, 1907, followed by a further visit in 1908, led the author to the conclusion that a largefeatured, round-shouldered, full-bodied mountain of pre-Glacial time, had been converted by erosion during the Glacial Period — and chiefly by glacial erosion — into the sharp-featured, hollow-chested, narrowspurred mountain of to-day. The peculiar indifference of topographic form to the trend of...
Page 25 - But according to Thomson, though the primitive fluid is the only true matter, yet that •which we call matter is not the primitive fluid itself, but a mode of motion of that primitive fluid.