Irrigation signal

Details Irrigation signal Irrigation signal

1975-09-02

1977-02-01

Caldwell, John W.

Communications: electrical

Systems

Call station

340235, 324 65P, G08B 2100

Patent

active

040064735

ABSTRACT:
A housing having an electrically conductive probe depending therefrom is supported by an electrically conductive shaft which is inserted into the ground. A perceptible signal, carried by the housing, which has a source of electrical energy stored therein, is activated as water rises to close a circuit between the probe and the shaft. The depth of insertion of the shaft predetermines the height of water necessary to activate the signal. Extensible means are provided to elevate the signal above crop height.

REFERENCES:
patent: 2437134 (1948-03-01), Smith
patent: 2461111 (1949-02-01), Flinspach et al.
patent: 3239829 (1966-03-01), Cline et al.

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