Automatic control of the moisture content of the soil

Fluid sprinkling – spraying – and diffusing – With cutoff or flow varying means operated by means...

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324 65P, B05B 1204

Patent

active

041946910

ABSTRACT:
The moisture content of the soil in each of a number of areas is maintained between predetermined wet and dry thresholds by a control having circuits operative in response to detected thresholds through contacts inserted in the soil to effect the opening and closing of a valve in the conduit by which water is delivered to that area. Typically a number of conduits are connected directly or through junctions to a common water supply and where that supply is pump controlled, the control for each conduit includes circuitry that enables a switch in the pump motor circuit to be closed whenever the valve operated by that control is open.

REFERENCES:
patent: 3599867 (1971-08-01), Griswold et al.
patent: 3626286 (1971-12-01), Rauchwerger
patent: 3956772 (1976-05-01), Cox
patent: 3968428 (1976-07-01), Numoto
patent: 4015616 (1977-04-01), Hanff

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