| 摘要 |
A bird-scattering device operative in response to the weight of the bird alighting thereon to provide an audible alarm effective to frighten birds in the vicinity thereof. The device includes a support casing having a chamber housing therein an electric circuit that comprises an audible alarm in series with a switch operative to complete the circuit whenever a bird alights upon the device. The switch provides as the movable element thereof a large perch normally biased into an inoperative position but displaceable into a closed alarm-energizing position effective to complete the electric circuit whenever a bird lights upon the perch.
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