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Aviation History
1950
1950 - 1644.PDF
x8 FLIGHT 31 AUGUST 1950 EXHIBITION TEDDINGTONCONTROLS LTD. MAKING FLYING SAFER ) No. 3 of a series Graviner Magnetic Fire Detector Switches (PAT. APPD. FOR)(Resetting Type) MAGNETIC Fire Detector Switches are thelatest and most promising line of devel- opment to meet the need for an efficient and foolproof resetting fire detector for piston engine and gas turbine power units. They would seem also to have a wide application where drift free temperature control is required at temperatures of 250°C, or 350°C. or 450°C. They depend for their operation on the property in magnetic materials known as the Curie point. The Curie point is that temper- ature at which a magnetic material becomes non-magnetic, and these materials regain their magnetic properties when cooled below the Curie point. The Royal Aircraft Establishment first pro- posed the application of this property for use in fire detection switches: simplicity, robustness and light weight are the key notes in the resulting Graviner design, which has proved itself immune to high g and a wide, range of vibration. Moreover, adoption of It*,*.* ——•»»<. the Curie point phenomenon nullifies the temperature detectors. Choice of operating temperature now becomes simply generally ardous and often expensive methods °f alb/ with known fixed Curie point f d l fid re sensing element, detectiontwice that time. •nerally ardous and otten expensive methods "•"""/ "••••' *""•••"«=« v,u"= H-"-- . , ,. ' .. '. i . .. r i -*• Owing to the small mass (approx. 2\ ozs.) and low heat capacity of the temperatu accurate adjustment essential in most fixe „•„,„. in the standard are of the order of I to 2 seconds and reset times only GRAVINER Airborne FIRE PROTECTION EQUIPMENT All Patent Bights assigned to:— THE GRAVINER MANUFACTURING CO. LTD., Poyle Mill Works, Colnbrook, Bucks. Tel.: Colnbrook 48. 4jjrnrs n Argentina, Australia, Canada, Denmark, East Africa, Holland, India, and Pakistan, Italy, New Zealand, Sweden, U.S.A.
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