Conduction of Electricity Through Gases and Radio-activity: A Text-book with Experiments

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P. Blakiston's son & Company, 1909 - Electric conductivity - 245 pages
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Page 115 - Gases around flames contain ions and conduct electricity. If two electrodes are placed some distance apart in an ordinary Bunsen flame quite an appreciable current is observed which may be measured by a galvanometer. If the air surrounding such a flame be drawn away from the flame it is found to be still a conductor. The ions which have been produced in the gas by the flame appear to be much larger than -those produced in other ways, for their velocity has been measured and found to be much less...
Page 127 - ... Discovery of Radio-Activity. — The phosphorescent action of Rontgen rays led physicists to investigate phosphorescent substances and Becquerel in 1896 found that the double sulphate of uranium and potassium emitted a radiation which produced an effect upon a photographic plate similar to that of X-rays. He later examined other compounds of uranium as well as the element itself and found that they all possessed this power. Although the phosphorescent action of Rontgen rays pointed the way to...
Page xiii - ... radioelements. The first of these consists in observing whether the rays are deflected in magnetic and electric fields. The radiations consisting of charged particles will be deflected ; the direction of the deflection decides whether the charge is positive or negative, and its amount gives information as to the velocity, and the ratio of the charge to the mass of the particles. In this way it was found that the radiations consist of three distinct types, called the a-, /3-, and y-rays.
Page 181 - Hence, the kinetic energy of a mass M moving with a velocity v is equal to...
Page 47 - If from a point without a circle, a secant and a tangent are drawn, the square on the tangent is equal to the rectangle contained by the secant, and the part of it without the circle, with converse.
Page 46 - IF a plate in which there is a longitudinal flow of heat is brought into a transverse magnetic field so that the lines of force are perpendicula'r to the plane of the plate...
Page 219 - ... namely, the atom of radium A, and the process is continued throughout the successive changes. The processes are not identical in all instances, for in some cases an a particle alone is expelled, but in others /? particles are expelled accompanied by j rays, while in others all three types are given out.
Page 142 - It will be seen that by far the greater portion of the electrically operated traffic is worked by motor-coaches rather than separate locomotives. This method of operation is peculiarly adapted for working suburban railways and will no doubt remain the standard. The chief advantage of locomotive operation is that the greater portion of the electrical apparatus...
Page 12 - ... a White pattern electrometer. I have therefore added to my paper a discussion of their results. It will be convenient to give my modified theory of a symmetrical instrument first, and then compare my conclusions with Ayrton and Sumpner's results. Let us first indicate the usual theory. Suppose Vj, V2, and V3 are the potentials of the two pairs of quadrants and the needle respectively.
Page 95 - This theory accounts for the fact that the positive and negative ions diffuse more nearly at the same rate in moist than in dry gases, for in dry gases the negative ion is smaller, but in a moist gas it becomes more loaded up with moisture than the positive ion and its rate of diffusion decreases more rapidly.

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