Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1974-09-30
1976-07-06
Corbin, John K.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324 65P, G01R 2720
Patent
active
039684288
ABSTRACT:
A ground moisture testing and indicating device designed for quick and simple measurement of ground moisture by an untrained layman for use in connection with sowing seeds, transplanting saplings and young plants, and cultivating plants of all kinds by ascertaining the ground moisture at predetermined depths. The device is particularly useful in irrigated gardening and horticultural and agricultural farming. As conductivity of electrical current in soil varies with the content of moisture therein, the resistance of the soil is a direct function of the moisture content of the soil. The present device measures resistance of the soil at a given depth and thereby indicates the moisture of the soil at that point. A direct current voltage is generated to indicate such value by a suitable indicating device, such as a meter, a sound device utilizing a loudspeaker, or an earphone, or a visual device, such as a lamp or photodiode, etc., for detection and evaluation. The device includes a sensor at the lower end of a ground insertion rod, the sensor being connected to an electrical circuit with suitable indicating devices at the head end of the device. The ground inserting rod is provided with an adjustable depth control device for controlling the insertion whereby the soil moisture being tested may be that of the soil at the mean depth of the plant roots which is different for different plants at different stages of their growths. The head end of the testing device may be in the shape of a walking stick handle for facilitating insertion of the rod into the ground.
REFERENCES:
patent: 1043150 (1912-11-01), Schweitzer
patent: 1910021 (1933-05-01), Legg
patent: 2437134 (1948-02-01), Smith
patent: 2461111 (1949-02-01), Flinspach et al.
patent: 2918054 (1959-12-01), Goolkasian
patent: 3306030 (1967-02-01), Wiley
patent: 3689832 (1972-09-01), Leto et al.
patent: 3757210 (1973-09-01), Hansen et al.
Corbin John K.
Punter Wm. H.
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