. Annual report of the American Institute, of the City of New York. Science. 50 TRANSACTIONS OF THE AMERICAN Giuseppe Tagliabue's Patent Coal-Oil Pyrometer, For which the Silver Medal of the American Institute was awarded. This cut represents two views of the Coal-Oil Pyrometer. The first one is as it appears when it is ready to test the burning point of the oil, with the sliding cover turned one side; and the second view is when it is ready to test the explosive point of the vapor of the oil. The lower part of the instrument con- tains a bath of water, with a lamp beneath, for the
. Annual report of the American Institute, of the City of New York. Science. 50 TRANSACTIONS OF THE AMERICAN Giuseppe Tagliabue's Patent Coal-Oil Pyrometer, For which the Silver Medal of the American Institute was awarded. This cut represents two views of the Coal-Oil Pyrometer. The first one is as it appears when it is ready to test the burning point of the oil, with the sliding cover turned one side; and the second view is when it is ready to test the explosive point of the vapor of the oil. The lower part of the instrument con- tains a bath of water, with a lamp beneath, for the purpose of heat- ing the water. Within the water bath is a cup for containing the oil which is to be tested. Over this water bath and oil cup is a. cover with a thermometer through it, and reaching down into the oil in the cup. The short cylinder on the sliding cover is for collecting the vapor of the oil when testing its inflammability. When the oil to be tested is placed in the oil cup, the lamp is lighted (burning with a small flame) and placed under the water bath, and the water and oil is gradually heated. The oil emits a vapor in proportion to its volatility. This vapor mingles with the atmospheric air, which is admitted through two perforations (marked d in the sliding cover), and thus forms an explosive mixture that ascends into the cylinder on the sliding cover; and on applying a lighted taper a slight explosion or puff of flame will take place, and on simultaneously inspecting the thermometer the temperature of its inflammability will be ascertained. After turning the sliding cover one side, as in the first view, and holding the lighted taper in con- tact with the escaping vapor till the oil ignites, on looking at the thermometer the burning point will be noted. DIRECTIONS FOR USE. 1. Lift off the cover, take out the oil vessel, and fill the water bath with water until the surface is just a quarter of an inch above the hent ends of the wires, or the support for the o
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