. A text book of physics, for the use of students of science and engineering . tream ofoxygen is supplied to the bell-jar througha tube O. W, W are wires passingthrough the bell-glass stopper, and areconnected at the lower ends by a pieceof fine iron wire which dips into the electric current is used for ignition ;on passing the current through the ironwire, it is heated to incandescence(some of it generally burns) and ignitesthe coal. The vessel S contains ameasured quantity of water, the tem-perature of which is measured by athermometer T. The combustion is thus effected in anatmosphe
. A text book of physics, for the use of students of science and engineering . tream ofoxygen is supplied to the bell-jar througha tube O. W, W are wires passingthrough the bell-glass stopper, and areconnected at the lower ends by a pieceof fine iron wire which dips into the electric current is used for ignition ;on passing the current through the ironwire, it is heated to incandescence(some of it generally burns) and ignitesthe coal. The vessel S contains ameasured quantity of water, the tem-perature of which is measured by athermometer T. The combustion is thus effected in anatmosphere of oxygen; the products ofcombustion pass downwards through Aand escape into the water through anumber of small holes. The resultingbubbles give up their heat to the wateras they pass upwards. Let Q = the heating value in calories per gram of =the mass of water used, in = the water equivalent of the instrument, in = the mass of coal burned, in = the initial temperature of the water, = thc final temperature of the water, C. (M+ivy^-g. Fig. :j(>7. -Darling calorimeterfor testing the heating value ofcoal or other solid fuel. Then Q M, Heating value of gaseous fuels.—In calorimeters of the Darlingtype, described above, a definite quantity of water is used, and thetemperature of the calorimeter rises as the test proceeds. In testinggaseous fuels, calorimeters air used in which the heat evolved duringtin combustion is passed into water which circulates through theinstrument. Arrangements are made so as to maintain, as steadyas possible, bol li t he (low of gas to the burner and the flow of water;hence the temperatures remain nearly constant throughout the xxvn HEATING VALUE OF FUEL 363 experiment. The calorimeter designed by Prof. C. V. Boys isillustrated in Fig. 368, and is typical of this kind of calorimeter. The gas is burned at jets B ; the products of combustion passupwards into a bell H and then downwards through E, in which spacei
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectphysics
