| 摘要 |
PROBLEM TO BE SOLVED: To trace and predict the orbit of the electrons in an electric field with simple manipulation by providing the device with a freely expandable and contractable film, members for fixing this film and a spherical object freely rolling on the film. SOLUTION: A metallic plate 5 is bored with plural holes and plural rods 3 are inserted in an erecting state into these holes. Rings 2 are respectively mounted at the respective rods 3. The rubber film 1 is fixed by these rings 2. The position at the peripheral edge of the rubber film 1 is so regulated as to satisfy given boundary conditions, allowing the position at the peripheral edge of the rubber film 1 to indicate the potential of the prescribed boundary conditions. At this time, the positions in the perpendicular directions at respective points exclusive of the peripheral edge of the rubber film 1 correspond to the magnitude of the potential at this points and the electrostatic field when the prescribed boundary conditions are given is embodied. The simulation of the orbit of the electrons in the electrostatic field is made possible by rolling the spherical object on the rubber film 1.
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