. Transactions of the American Philosophical Society. B „{ D ;;. Iron oven used in experiments upon oxidation temperatures. fraction of a degiee Centigrade. I^^itrogen-fillcd mercury thermometers were usedup to 300° in the following experiments, and in order to measure higher tempeia-tures, metallic salts of known fusing point were employed. A few grains or crystalsof the carefully purified salt were placed in a fine glass tube previously drawn outto a point. Such a tube was placed in the side neck of the iron oven and plungedinto the iron turnings. The temperature of oxidation of the hydr
. Transactions of the American Philosophical Society. B „{ D ;;. Iron oven used in experiments upon oxidation temperatures. fraction of a degiee Centigrade. I^^itrogen-fillcd mercury thermometers were usedup to 300° in the following experiments, and in order to measure higher tempeia-tures, metallic salts of known fusing point were employed. A few grains or crystalsof the carefully purified salt were placed in a fine glass tube previously drawn outto a point. Such a tube was placed in the side neck of the iron oven and plungedinto the iron turnings. The temperature of oxidation of the hydrocarbon gas couldthen be ascertained to occur between the melting points of two salts. This method,which is simply an adaptation of the process commonly used for the determinationof melting points, proved very satisfactory. It was not possible to employ an airthermometer, as this would have necessitated an inconveniently large oven. Thefollowing list of substances, with their melting points, includes those which wereused in the experiments detailed below. Potassi
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