Physical ReviewAmerican Physical Society, 1911 In Feb. 1903, the separate publication of the Bulletin of the American Physical Society was discontinued and Its Proceedings published in the Physical review. |
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alloys ammeter amperes antimony apparatus arc current arc length atomic weight bands bismuth bolometer cadmium capacity cathode cathode fall cent charge circuit Clark cell coefficient coil condenser constant copper coupling curves decay decrease deflection density determined diameter direct current discharge distance drop effect electrical electrodes electromotive electromotive force energy equation error experimental experiments formula frequency galvanometer gas pressure gases given heat increase inductance intensity ionization ions Lecher system Lecher wires Lepel arc light lines magnetic field maxima maximum mean measured mercurous sulphate mercury metal method minima molecules Nernst effect observed obtained ohms oscillations paper presented phosphorescence photometer PHYS Physical Society plate platinum positive potential difference produced radiation radius ratio readings resistance salts secondary selenium shown in Fig spark spark gap specimens surface Table temperature theory tion tube variation varied velocity vibrations voltage volts wave-length zero zinc
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Página 419 - The velocity of light is independent of the velocity of the source. The third and last premise (F3), which we shall need states: The velocity of light does not depend on the velocity of the source.
Página 349 - The method used in the former work consisted essentially in catching ions by CTR Wilson's method on droplets of water or alcohol, in then isolating by a suitable arrangement a single one of these droplets, and measuring its speed first in a vertical electrical and gravitational field combined, then in a gravitational field...
Página 349 - THE CORRECTION OF STOKES'S LAW.1 By RA MILLIKAN. INTRODUCTION. In a preceding paper 2 a method of measuring the elementary electrical charge was presented which differed essentially from methods which had been used by earlier observers only in that all of the measurements from which the charge was deduced were made upon one individual charged carrier. This modification eliminated the chief sources of uncertainty which inhered in preceding determinations by similar methods such as those made by Sir...
Página 354 - This equation involves no assumption whatever save that the speed of the drop is proportional to the force acting upon it, an assumption which is fully and accurately tested experimentally in the following work. Furthermore, equation (1) is sufficient not only for the correct determination of the relative values of all of the charges which a given drop may have through the capture of a larger or smaller number of ions, but it is also sufficient for the establishment of all of the assertions made...
Página 354 - ... of the charges which a given drop may have through the capture of a larger or smaller number of ions, but it is also sufficient for the establishment of all of the assertions made above, except 3, 4, and 6. However, for the sake of obtaining a provisional estimate of. the value of m in equation (1), and therefore of making at once a provisional determination of the absolute values of the charges carried by the drop, Stokes's law will for the present be assumed to be correct, but it is to be distinctly...
Página 350 - ... sources that all electrical charges, however produced, are exact multiples of one definite elementary, electrical charge, or in other words, that an electrical charge instead of being spread uniformly over the charged surface has a definite granular structure, consisting, in fact, of an exact number of specks, or atoms of electricity, all precisely alike, peppered over the surface of the charged body.
Página 355 - ... feet of water, and second, by shutting off the light from the arc altogether except at occasional instants, when the shutter was opened to see that the star was in place, or to make an observation of the instant of its transit across a cross hair. Further evidence of the complete stagnancy of the air is furnished by the fact that for an hour or more at a time the drop would not drift more than two or three millimeters to one side or the other of the point at which it entered the field.
Página 350 - The sources of error or uncertainty which still inhered in the method arose from: (1) The lack of complete stagnancy in the air through which the drop moved; (2) the lack of perfect uniformity in the electrical field used; (3) the gradual evaporation of the drops, rendering it impossible to hold a given drop under observation for more than a minute, or to time the drop as it fell under gravity alone through a period of more than five or six seconds; (4) the assumption of the exact validity of Stokes's...
Página 282 - The direction of twist in iron, so long as the longitudinal magnetizing field is not strong, is such that if the current is passed down the wire from the fixed to the free end and the wire is magnetized with north pole upwards, the free end, as seen from above, twists in the direction of the hands of a watch.
Página 359 - ... from the difference in the values of en, given by equation (1), and if it be assumed that the value of m is approximately known through Stokes's law, then the approximately correct value of the charge on the captured ion is given by the difference between the values of en obtained through equation (4). The mean value of this difference obtained from all the changes in the latter half of Table I (see Differences), is 4.93 X10-10.