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John R. Pierce / Electron Tubes (7432 words) |
 | If we regard the motion of electrons as governed by the electric (and magnetic) fields in which they move, and disregard interactions of one electron on others, this applies to electrons in vacuum tubes, and the coordinates are the three position coordinates and the three velocity coordinates. |
| These were electron flow between an infinite parallel plane cathode and an infinite parallel plane anode, flow between a cylindrical cathode and a central cylindrical anode, and flow between a spherical cathode and a central spherical anode. |
| One was that of focusing the electron beam. |
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