THE GOODYEAR TIRF AND RUBBER Co., AKRON, OHIO SVO methods have presented t h e in -T selves to various investigators as possible ways of measuring the operating temperatures of pneumatic tires. One is the determination of the temperature from pressure-volume changes of the air confinedThe thermocouple methods hitherto employed are shown to gioe temperature measurements in rubber articles, tires, efc., which are much too low, unless there is little or no temperaturedifferentialfor seoeral inches along the wiresfrom the thermaljunction.Curoes are given whereby many temperature measurements recorded in the literature may be corrected.A new thermocouple casing is described which has been found conoenient for the measurement of temperatures in solid or pneumatic tires while the latter are in use on the road.

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