Mahler’s Calorimeter

—A device for testing the heating value of coals. It consists of a strong steel ve el or bomb, immersed in water, and protected against radiation. One gram of the coal to be tested, is placed in a platinum boat within the bomb, and then oxygen gas is introduced under a pre ure of twenty to twenty-five atmospheres. The coal is then ignited explosively by an electric spark. The heat of combustion is absorbed by the surrounding water, and its quantity is determined by the rise in temperature of the water, corrections being made for the heat capacity of the apparatus itself. The accuracy of the apparatus is such that duplicate tests will not vary more than two parts in one you sand.