The analysis of fuel, gas, water, and lubricants . 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
The analysis of fuel, gas, water, and lubricants . 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 added to the bomb. Fig. 38.—Method of filling oxygen bomb with oxygen. which is placed in the octagon holder for receiving the cover withthe fuel and capsule in place. In turning down the cap upon thecover apply the large wrench using good firm pressure, thoughonly moderate force is necessary for securing a perfect seal atthe rubber gasket. For filling with oxygen, connection is made with the flexiblecopper tubing (see Fig, 38) and oxygen is admitted until apressure of 25 to 30 atmospheres is indicated. In admitting theoxygen the needle valve next to the pressure gage is openedslightly to avoid a sudden rush of gas. After a sufficient amounthas been admitted, close the needle valve and open the pet cockbelow the gage in order to release the oxygen under pressure in 16G FUEL, GAS, WATER AND LUBRICATION the tube and connections. The check valve, V, Fig. 35, auto-matically closes and retains the oxygen at the desired pressure. Transfer the bomb carefully, without jarring, to the oval ca
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectchemist, bookyear1922
