GB643867A - Smoke detector and signal - Google Patents

Smoke detector and signal

Info

Publication number
GB643867A
GB643867A GB17902/47A GB1790247A GB643867A GB 643867 A GB643867 A GB 643867A GB 17902/47 A GB17902/47 A GB 17902/47A GB 1790247 A GB1790247 A GB 1790247A GB 643867 A GB643867 A GB 643867A
Authority
GB
United Kingdom
Prior art keywords
smoke detector
signal
lamp
lights
july
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB17902/47A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CO Two Fire Equipment Co
Original Assignee
CO Two Fire Equipment Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by CO Two Fire Equipment Co filed Critical CO Two Fire Equipment Co
Publication of GB643867A publication Critical patent/GB643867A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/534—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke by measuring transmission alone, i.e. determining opacity

Abstract

643,867. Lamp failure alarms. C-O-TWO FIRE EQUIPMENT CO. July 7, 1947, No. 17902. Convention date, Oct. 2, 1945. Drawings to Specification. [Class 118 (ii)] [Also in Group XL (b)] A relay in series with the lamp of a smoke detector falls back if the filament fails and lights a trouble lamp.
GB17902/47A 1945-10-02 1947-07-07 Smoke detector and signal Expired GB643867A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US643867XA 1945-10-02 1945-10-02

Publications (1)

Publication Number Publication Date
GB643867A true GB643867A (en) 1950-09-27

Family

ID=22055599

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17902/47A Expired GB643867A (en) 1945-10-02 1947-07-07 Smoke detector and signal

Country Status (1)

Country Link
GB (1) GB643867A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539202A2 (en) * 1991-10-22 1993-04-28 Gec-Marconi Limited Exhaust gas particle sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0539202A2 (en) * 1991-10-22 1993-04-28 Gec-Marconi Limited Exhaust gas particle sensor
EP0539202A3 (en) * 1991-10-22 1993-06-16 Gec-Marconi Limited Exhaust gas particle sensor

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