Storm severity monitoring system

Details Storm severity monitoring system Storm severity monitoring system

1974-12-23

1976-05-04

Caldwell, John W.

Communications: electrical

Land vehicle alarms or indicators

Of burglary or unauthorized use

325364, 343788, G08B 2100

Patent

active

039551920

ABSTRACT:
An audible alarm storm severity monitor utilizes an electromagnet as a primary sensor in connection with an audio frequency amplifier to modify the conductivity of a silicon controlled rectifier, the conductivity modification effecting a corresponding change in current in an associated direct current audible alarm to sound the alarm. A variable resistance control network is interposed between the amplifier and the SCR to establish a quiescent condition in the absense of any atmospheric electromagnetic disturbance within the detection range of the monitor, this range or sensitivity being selectively determined by means of an appropriate adjustment in the resistance control network.

REFERENCES:
patent: 3753117 (1973-08-01), Downing, et al.
patent: 3810137 (1974-05-01), Bacon, Jr. et al.

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