Communications: electrical – Selective – Having electron beam device
Patent
1974-06-25
1976-02-24
Wilbur, Maynard R.
Communications: electrical
Selective
Having electron beam device
340 16R, 340258B, H04B 1100, G01S 380
Patent
active
039407330
ABSTRACT:
A seismic surveillance system for detecting intruders, and the like. A seic transmitter coupled to the trunk of a tree establishes a seismic field in the earth via the roots of the tree. A seismic receiver similarly coupled to another tree detects the field and the presence of an intruder on the earth in which the field is established is detected by noting changes in the phase, amplitude, or frequency of the seismic field.
REFERENCES:
patent: 1549032 (1925-08-01), Squier
patent: 3302746 (1967-02-01), Ikrath
patent: 3646562 (1972-02-01), Acker et al.
Ikrath Kurt
Johnson Ronald F.
Bowers Arthur L.
Buczinski S. C.
Edelberg Nathan
Gibson Robert P.
The United States of America as represented by the Secretary of
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