| 摘要 |
A marine speedometer for use on small boats has a mounting for fitting to the hull of the boat, the mounting projecting through the hull. The mounting supports a vertical shaft the lower end of which carries a wand deflectable against a restoring force by the movement of the water past the boat to turn the wand about the shaft axis to a position dependent on the speed of the boat. The shaft is turned with the wand and is coupled to the wiper of a rheostat located in board of the boat. The rheostat is part of an electrical circuit providing a speed indication. Additionally an integrating circuit may be provided to give a log of distance covered.
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