Title: Electronic fish locator

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Abstract: Apparatus for determining the depth of certain temperature layers or strata in ponds, lakes, etc. The disclosed apparatus includes a thermistor, an electrical wire or cable attached to the thermistor and provided with depth measurement markings in a simple graphic code, and a translator circuit adapted to be attached to the end of the wire or cable remote from the thermistor for translating the resistance of the thermistor into an indication of the temperature range of the water layer or stratum in which the thermistor is immersed. The translator circuit includes a set of light-emitting diodes (LED's) for use in indicating the temperature range of the water stratum in which the thermistor is immersed. In general, when the disclosed apparatus is in use only one LED, corresponding to the temperature of the water stratum in which the thermistor is immersed carries sufficient current to be perceptibly illuminated. At one extreme of temperature indication, however, a second LED may appear to be faintly illuminated. The translator circuit is battery-operated, and is self-compensating for aging variations in battery voltage throughout the practical life of the battery, i.e., until the light produced by the illuminated LED is too dim to be readily perceived in the ambient sunlight in an open boat.


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