The analysis of fuel, gas, water, and lubricants . s most conveniently held on a supported, the fuel capsule and fuse wire are readilyadjusted. For coal approximately one gram of the air-dry sample,ground to pass a 60-mesh sieve, is accurately weighed in thecapsule, //, Fig. 35. Attach the ignition wire to the terminalsby passing one end through the eyelet of one of the terminals soit will extend beyond the eyelet about 1 cm. Wrap the free wirearound the terminal at the narrow portion formed by the notch,giving it three turns, binding in the free end and bending thewire finally
The analysis of fuel, gas, water, and lubricants . s most conveniently held on a supported, the fuel capsule and fuse wire are readilyadjusted. For coal approximately one gram of the air-dry sample,ground to pass a 60-mesh sieve, is accurately weighed in thecapsule, //, Fig. 35. Attach the ignition wire to the terminalsby passing one end through the eyelet of one of the terminals soit will extend beyond the eyelet about 1 cm. Wrap the free wirearound the terminal at the narrow portion formed by the notch,giving it three turns, binding in the free end and bending thewire finally downward in line with the terminal. Repeat thesame process with the other end of the wire. The fuse wireshould be about 7 cm. long. That part of the wire between the 164 FUEL, GAS, WATER AND LUBRICATION terminals should be bent into a somewhat narrow U-shaped loopso that the fuse wire will not touch the sides of the capsule, Adjust the wire so that the lower part of the fuse loopwill just touch the surface of the coal. In using sugar for. Fig. 37.—Oxygen bomb calorimeter, dismantled. standardizing purposes it is well to give the wire a number ofshort turns in such a manner that the spiral will come in contactwith the sugar, which is difficult to ignite with the wire in asimple loop. Benzoic acid or naphthalene are easy to igniteand do not need the extra looping of the wire. In the case of CALORIMETRY USING THE OXYGEN BOMB 165 naphthalene, to insure against loss of the charge upon igniting, itis well to heat approximately 1 gram in the capsule to the pointof incipient fusion and then obtain the accurate weight. Thecake-like mass will readily ignite if the wire loop simply touchesthe surface. Loss by volatilization or spurting is thus the case of coal or standard material the amount to be takenis a matter of choice. An exact gram simplifies slightly thecalculations, but is apt to prolong unduly the weighing small amount of water, to gram is
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectchemist, bookyear1922
