Philosophical MagazineTaylor & Francis., 1914 - Physics |
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Page 172
... current- E.M.F. curves were either slightly convex to the voltage axis or almost linear . With subsequent heating under potential the usual saturation - current conditions obtained . The positive thermionic current from the wire was ...
... current- E.M.F. curves were either slightly convex to the voltage axis or almost linear . With subsequent heating under potential the usual saturation - current conditions obtained . The positive thermionic current from the wire was ...
Page 173
... Thermionic Currents in Air at a given temperature produced by heating the wire at higher temperatures . A measurable current ( one - half of one div . per second ) with + 200 volts was obtainable at a temperature of 600 ° C. The ...
... Thermionic Currents in Air at a given temperature produced by heating the wire at higher temperatures . A measurable current ( one - half of one div . per second ) with + 200 volts was obtainable at a temperature of 600 ° C. The ...
Page 175
... current readings obtained at 628 ° C. after heating in air at various temperatures . CURVE II ( ) . Slow decay ... thermionic current , tested at the fiducial 628 ° C. point , reached an extrapolated maximum value of about 260 div . per ...
... current readings obtained at 628 ° C. after heating in air at various temperatures . CURVE II ( ) . Slow decay ... thermionic current , tested at the fiducial 628 ° C. point , reached an extrapolated maximum value of about 260 div . per ...
Page 178
... thermionic emission obtained after heating at 654 ° C. can be explained in an analogous manner by assuming a ... current at 765 ° C. than had been just previously obtained at this lower tem- 178 Dr. C. Sheard on the Positive.
... thermionic emission obtained after heating at 654 ° C. can be explained in an analogous manner by assuming a ... current at 765 ° C. than had been just previously obtained at this lower tem- 178 Dr. C. Sheard on the Positive.
Page 179
... thermionic currents read at 765 ° C. Time Time Current . ( Min . ) . Current . ( Min . ) . Time ( Min . ) . Time Current . Current . ( Min . ) . 0 3.2 0 5.2 0 2.0 0 0.72 2.5 2.5 1.5 3.3 1 2.2 1 0.67 4.5 2 : 0 2.5 2.6 2 2.0 2 0:45 7 1.9 ...
... thermionic currents read at 765 ° C. Time Time Current . ( Min . ) . Current . ( Min . ) . Time ( Min . ) . Time Current . Current . ( Min . ) . 0 3.2 0 5.2 0 2.0 0 0.72 2.5 2.5 1.5 3.3 1 2.2 1 0.67 4.5 2 : 0 2.5 2.6 2 2.0 2 0:45 7 1.9 ...
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absorption actinium active deposit aluminium angle anode apparatus approximately atom atomic weight axis calculated carbon cent CH CH CH CH₂ charge coefficient coil constant corresponding crystal curve deflexion determined diameter direction discharge distance effect electric field electrometer electrons electroscope element emanation emission emitted energy equal equation Ernest Rutherford experimental experiments flicker force formula frequency galvanometer gases give given heating hydrogen increase ionization ionization potential ions J. J. Thomson lines liquid magnetic field maximum measured metal method molecules motion negative observed obtained paper Phil photoelectric effect Phys plane platinum positive potential pressure produced quantity radiation ratio rays from radium reflexion Rockall Rutherford shown spectra spectrum speed string substance surface temperature theory thermionic current tube velocity volts volume wave-length waves wire X rays zero