| 摘要 |
The proposed device for warning of earthquake contains an antenna, which is designed for receiving electromagnetic signals that propagate in the environment, and an alarm unit. The alarm unit contains a casing made of insulating material, two hollow metallic balls, which are arranged in the casing, and an indicator. One of the balls is fixed to the inside surface of the casing, and the other ball is installed at the end of the arm, which is coupled with the indicator. The fixed ball is electrically connected to the output of the antenna.
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