| 摘要 |
A terrestrial globe has a base seat, a semicircular plate connected to the base seat, and a spherical shell supported by the semicircular plate. The-spherical shell has a top aperture and a bottom hole. The base seat has an upper socket. The semicircular plate has a distal post inserted in the top aperture of the spherical shell and a proximal plug having a round hole. A motor has a motor shaft. A pinion receives the motor shaft. A pivot tube is disposed on a positioning seat. A base disk which is disposed on the proximal plug has a center hole and a plurality of oblong holes. A gear has a center aperture and a plurality of upper protruded blocks inserted in the oblong holes of the base disk. The gear which is. inserted in the round hole of the proximal plug engages with the pinion. The pivot tube is inserted through the gear. The positioning seat is disposed on the gear. A collar is inserted in the bottom hole of the spherical shell.
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