The Electrical Properties of Flames (Google eBook)

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University of California., 1912 - 64 pages
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Page 2 - ... the ratio of the charge e to the mass m of the electron. In this manner I have made the first determination of this notable number e/tn, and found it of the order of magnitude of 10* electromagnetic units per gram.' The most accurate measurements of the present time for different spectral lines yield values ranging between 1-4 and 1-8 by 10'.
Page 117 - K where R denotes the resistance and H the magnetic field. It appears, therefore, that the effect of the magnetic field is made up of two parts, one proportional to the square of the field, and the other proportional to the field. The lack of symmetry is evidently connected with the upward motion of the flame. We have seen that when the top and bottom of the flame are insulated the horizontal velocity of the negative ions is given by u = k2...
Page 109 - The amount of salt entering the flame per minute when a solution containing one gram per litre was sprayed was 0'053 milligram. The velocity of the flame gases was about 200 cms. per sec., and the diameter of the flame about 3 cms., so that the 1 HA Wilson and E.
Page 103 - ... near it; whereas a new negative ion formed in the slab cannot reach either electrode, except by diffusion, which we shall neglect. Thus we may regard the whole space between the plates as filled with positive electricity of density + ne, and the vibrating slab of thickness D d as containing also negative electricity of density ne. Thus inside the slab the total density is zero, and outside is + ne. Let X denote the electric intensity between the plates at a fj V distance x from one of...
Page 106 - ... positive charge near the negative electrode to become sufficient to make the electric force near the positive electrode zero. Thus the two electrodes will behave like a condenser when the PD is applied. When a rapidly alternating PD is applied it is easy to see that even if the positive ions...
Page 104 - A-,, 1 , where A is a constant representing the viscous resistance to motion with unit velocity. Let m be the mass of a negative ion; then its equation of motion is...
Page 101 - D, was connected to the points M and N of the bridge. This detector consisted of two platinum electrodes dipping into 20 per cent. sulphuric acid. One electrode was a platinum cylinder 3 cms. in diameter and 4 cms. high, while the other was a platinum wire T-jnnr inch in diameter sealed into a glass tube and cut off close to the surface of the glass.
Page 100 - FIG. 27. electrodes used were concentric platinum cylinders 5 cms. high and 2 '4 and 1-2 cms. in diameter. The conductivity between the electrodes was determined by means of a Wheatstone-bridge arrangement, of which the electrodes formed one arm, and the other three arms consisted of small air condensers, the capacity of one of which was adjustable with a micrometer screw. An induction-coil, I, charged two Leyden jars Jlt J2, and these discharged at a spark gap S.
Page 103 - B (Fig. 28) be the two plates, and let the slab be represented by the space between the two dotted lines E, F. Let D V, AEFB FIG.
Page 43 - Rutherford found that this equation represented his experimental results fairly well when l was not less than two or three cms., so that his currents were extremely small compared with the saturation currents. When l is small, and i not too small, the equation (1) reduces to which is of the same form as we found for cylindrical electrodes when the electric field was not much affected by the ions. This equation obviously affords a simple method of finding k. . i F . According to the equation...

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