Communications: electrical – Systems – Call station
Patent
1974-10-21
1977-04-12
Swann, III, Glen R.
Communications: electrical
Systems
Call station
200 612, 200 84R, 200DIG8, 340244B, 340279, G08B 2100
Patent
active
040178420
ABSTRACT:
A swimming pool alarm system which is responsive to the height of waves resulting from unauthorized entry, and which includes provision for changing its sensitivity. An alarm circuit is provided with a switch having a plurality of stationary contacts spaces apart as a function of wave height, and another contact movable by a float positioned in the water. A switch is provided to select the stationary contact which corresponds to a preselected wave height of interest.
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patent: 1081843 (1913-12-01), Larson
patent: 1307086 (1919-06-01), Dijkstra
patent: 2474154 (1949-06-01), McCauley
patent: 2774058 (1956-12-01), Raichel
patent: 3058101 (1962-10-01), Malvini
patent: 3155952 (1964-11-01), Boehm et al.
patent: 3482237 (1969-12-01), Hamburg et al.
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