| 摘要 |
Device for measuring the relative change in a variety of physical phenomenon, such as acceleration, pressure, temperature, etc., by an audible signal. A transducer has a pivoted extensible rod for indicating changes in velocity of an object moved through a fluid medium, such as water. The rocking of the arm is operative to shift a ferrite core within an insulated coil forming one part of an audio oscillator circuit. The coil is connected to a portable transistor radio, and the movement of the ferrite core through the insulated coil changes the induction of the coil producing a change in the audio oscillator circuit in a transistor radio. This produces a change in the sound produced by the radio. According to an alternate form, a stationary rod on which a strain gauge is mounted is similarly connected to a transistor radio.
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