Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1976-07-22
1977-09-27
Goldstein, Herbert
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73170A, 340228R, 340378R, G01K 724
Patent
active
040503089
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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patent: 3796951 (1974-03-01), Joseph
patent: 3922808 (1975-12-01), Rieth et al.
patent: 3927571 (1973-12-01), Athey
patent: 3946364 (1976-03-01), Codomo et al.
patent: 3969672 (1976-07-01), Wallander
patent: 3987392 (1976-10-01), Kugelman et al.
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