Registers – Calculators – Bar
Patent
1976-09-27
1978-11-07
Tomsky, Stephen J.
Registers
Calculators
Bar
235 85R, 235 89R, G06G 102, G06C 300
Patent
active
041247957
ABSTRACT:
A calculator and method for simply and quickly selecting appropriate spot type fire detectors and determining their preferred locations in a chosen space division in accordance with standard spacing ratings. The slide rule-like calculator includes a body member, a slide member slidably positioned within said body member, and in one embodiment a cursor slidably encompassing both the body member and slide member. The body member comprises at least one logarithmic scale representing one dimension of the space division and the slide member comprises at least one logarithmic scale representing the second dimension of the space division. Additionally, at least one fire detector scale, established with reference to standard space detector ratings, is included either on said body or slide member and an index or zero line is included on the other member. This calculator admits when constrained by the dimensions and ceiling type of the space to be protected of a simple accurate selection method for spot type fire detection devices of varied characteristics and capacities.
REFERENCES:
patent: 3120342 (1964-02-01), Geiger
patent: 3146942 (1964-09-01), Gaudier-Pons
patent: 3467307 (1969-09-01), Levitt
patent: 3627199 (1971-12-01), Hill
patent: 3712974 (1973-01-01), Martin
patent: 3795795 (1974-03-01), Gulbransen, Jr.
patent: 3814308 (1974-06-01), Kolan
patent: 3853264 (1974-12-01), Hovarka
patent: 3858798 (1975-01-01), Feingold
American District Telegraph Company
Haley, Jr. James F.
Tomsky Stephen J.
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