Gas and fuel analysis for engineers A compend for those interested in the economical application of fuel Prepared especially for the use of students at the Massachusetts institute of technology . mployed are Bohe-mian-glass combustion tubing or water-cooled metaltubes; those of porcelain or platinum are also some-times used. Glass and porcelain tubes when subjectedto high temperatures must be previously warmed orgradually inserted: the former may be used up totemperatures of 6oo° C. (12000 F.). Uncooled metaltubes, other than those of platinum, should under nocircumstances be used.* * Fischer,
Gas and fuel analysis for engineers A compend for those interested in the economical application of fuel Prepared especially for the use of students at the Massachusetts institute of technology . mployed are Bohe-mian-glass combustion tubing or water-cooled metaltubes; those of porcelain or platinum are also some-times used. Glass and porcelain tubes when subjectedto high temperatures must be previously warmed orgradually inserted: the former may be used up totemperatures of 6oo° C. (12000 F.). Uncooled metaltubes, other than those of platinum, should under nocircumstances be used.* * Fischer, Technologie der Brennstoffe, 1880, p. 221, statesthat the composition of a gaseous mixture was changed from per cent carbon dioxide, by the passage through an irontube heated to a dull red heat, the carbonic oxide originallypresent reducing the iron oxide with the formation of carbondioxide. INTRODUCTION AND METHODS OF SAMPLING. 3 The metal tube with the water cooling is made asshown in Fig. i, c being a piece of brass pipe 3feet long, \\ inches outside diameter, b the samelength, I inch in diameter, and a \ inch in water enters at d and leaves at e. The walls of. Fig. 1.—Gas-sampling Tube. the tubes are T\ inch thick. The joint at A shouldbe brazed; the others may be soldered. Platinum tubes from their high cost and small boreare seldom used; they are attacked by carbon, cyan-ogen, arsenic, and metallic vapors. 2. Apparatus for the Collection of Samples.—A convenient sampling apparatus is shown in Fig. may be made from a liter separatory funnel—in-stead of the bulb there shown—fitted with a rubberstopper carrying a tube passing to the bottom and aT tube; both of these, except where sulphur-con-taining gases are present, can advantageously bemade of TVinch lead pipe. The stopper should notbe fastened down with wire between the tubes afterthe manner of wiring effervescent drinks, as thisdraws the rubber away from the tubes and occasionsa le
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