Method of creating an electric field for shark repellent

Details Method of creating an electric field for shark repellent Method of creating an electric field for shark repellent

1978-07-24

1980-07-08

Martin, John C.

Telecommunications

Transmitter and receiver at separate stations

Earth or water medium

455100, 119 3, 49 59, H04B 102, H05C 104

Patent

active

042119804

ABSTRACT:
Method for repelling sharks and the like by creating an electric field containing a zone about an anode and/or cathode electrodes submersed in salt water. A voltage gradient of sufficient magnitude to overstimulate the nervous system of a shark has been found. The applied voltage is insufficient to disturb most scaled fish and man. The electric field is determined by considering the free space solutions of Maxwell's electro-magnetic field equations. The d.c. square wave potential is applied to the electrodes for that period of time wherein electron flow from cathode to anode is continued. The square wave potential is maintained only long enough to allow nervecell response in a shark. It is turned on with a frequency near a shark's nervous system's normal frequency.

REFERENCES:
patent: 3164772 (1965-01-01), Hicks
patent: 3265972 (1966-08-01), Curry
patent: 3683280 (1972-08-01), Holt
patent: 3822403 (1974-07-01), Coleman

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