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 . Fig. 16—MahlersBomb. 84 GAS AND FUEL ANALYSIS. to be burned. If this be coal, slightly over one gramshould be used. It is usually best inserted from asmall test-tube weighed before and after, with dueprecautions against loss. The ignition-wire should dip well into the coal. The fineness required in the combustible depends. Fig. 17.—Mahlers Apparatus Complete. upon its nature. Anthracite coal should be
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 . Fig. 16—MahlersBomb. 84 GAS AND FUEL ANALYSIS. to be burned. If this be coal, slightly over one gramshould be used. It is usually best inserted from asmall test-tube weighed before and after, with dueprecautions against loss. The ignition-wire should dip well into the coal. The fineness required in the combustible depends. Fig. 17.—Mahlers Apparatus Complete. upon its nature. Anthracite coal should be in a veryfine powder, at least 100 mesh. Trial will show whetherany unburned grains remain, indicating that the com-bustible is too coarse. The standard which carries the pressure-gaugeshould be screwed to the table near the bomb-clamp,and the oxygen cylinder must be placed near by sothat the three may be easily connected by the flexiblecopper tube. FUEL ANALYSIS—HEATING VALUE. 85 The top carrying the charge is then cautiously (toavoid loss of charge by jarring or draft) transferred tothe bomb and screwed carefully home. The lifting isbest done by hooking the fingers beneath the milledhead at the top of the valve-screw R. The top mustbe set up hard by the wrench which takes the largenut cut on the cover. In setting this up it is desirableto use no more force than is necessary to secure a gas-tight bearing of the tongue of the cover against thelead washer P. Just the force required can only belearned by
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