Communications: electrical – Systems – Call station
Patent
1975-07-11
1977-09-27
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
104279, 246428, 340 22, 340 47, 340417, G08B 2100
Patent
active
040514668
ABSTRACT:
The arrangement includes at least one first and at least one second electrode positioned one above the other and spaced from each other in the vertical direction by at least one respective interelectrode gap which can be bridged over by snow, ice and other forms of freezing precipitation to produce an interelectrode gap resistance decrease. A detecting circuit is electrically connected across the electrodes and is operative for detecting the bridging of the interelectrode gap by snow, ice or other forms of freezing precipitation by detecting the interelectrode gap resistance decrease resulting therefrom.
REFERENCES:
patent: 1957977 (1934-05-01), Packer
patent: 3157800 (1964-11-01), Burwell
patent: 3440396 (1969-04-01), Greene
Caldwell Sr. John W.
Eltra KG Leicht & Trambauer
Myer Daniel
Striker Michael J.
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