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Original Articles

Determination of the Cooling Rate for an Incandescent Headlight Filament

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Pages 61-64 | Published online: 22 Nov 2013
 

ABSTRACT

The rate at which a filament cools from incandescence to room temperature was determined for the respective filaments in a double beam headlight. The measurements were made in an atmosphere of 88% argon and 12% nitrogen at a reduced pressure of 600 mm mercury. From the cooling curve obtained, it was determined the filament may remain ductile for up to eight seconds after the headlight was turned off.

RÉSUMÉ

Le taux auquel un filament incandescent refroidit à la température de la pièce pour des filaments retrouvés dans un phare à double faisceaux a été mesuré dans une atmosphère de 88% argon et 12% azote à une pression de 600 mm de mercure. Il a été déterminé, à partir des courbes de refroidissement, qu'un filament pourrait demeurer ductile jusqu'à huit secondes après que le phare a été éteint.

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