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Marine instrument

  • US 4,644,787 A
  • Filed: 08/16/1985
  • Issued: 02/24/1987
  • Est. Priority Date: 06/01/1984
  • Status: Expired due to Term
First Claim
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1. A marine transducer device adapted for mounting to the exterior transom of marine vessels comprising:

  • (a) a housing in which an electromagnetic sensor is mounted;

    (b) a pair of support members attached to said housing and extending laterally therefrom adjacent said electromagnetic sensor;

    (c) a paddlewheel rotatably mounted in a vertically unenclosed position between said support members for generating a patterned electromagnetic field which extends from the paddlewheel to the sensor;

    (d) lead wires coupled to said sensor for coupling pulsed electrical signals to display devices on said marine vessel said signals being linearly proportional to the rotational speed of said paddlewheel as said paddewheel rotates.

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