. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . gen for sustainingcombustion is obtained from the air. 16. What per cent, of oxygen is inthe atmosphere? A.—The atmosphere contains PCcent, of oxygen. 17. Is air necessary for combustion?A.—It is. 18. About how many cubic feet of air required lor combustion would be 40 x260 = 10,400 cubic feet. 20. Why is it necessary to provide forcombustion a supply of air through thefuel in the furnace? A.—Because it is only by forcing theair through tlie burning fuel that theproper mixture of the ga
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . gen for sustainingcombustion is obtained from the air. 16. What per cent, of oxygen is inthe atmosphere? A.—The atmosphere contains PCcent, of oxygen. 17. Is air necessary for combustion?A.—It is. 18. About how many cubic feet of air required lor combustion would be 40 x260 = 10,400 cubic feet. 20. Why is it necessary to provide forcombustion a supply of air through thefuel in the furnace? A.—Because it is only by forcing theair through tlie burning fuel that theproper mixture of the gases will be ef-fected. GENERAL Qoestions Answered CYLINDER LUBRICATION. (20) F. B. W., Genoa, Neb., asks:Is it safe to run any considerable dis-tance without allowing a little steam toenter the cylinder to carry lubrication toit in case of derangement of the valvegear and consequent necessity of cover-ing ports? A.—Yes, it is safe. Sinceno steam or condensation can reach thecylinder when ports are completely cov-ered, there is nothing to destroy the lu-brication except the cylinder packing. QUEENS VIEW, LOCH TUMMEL, .SCOTL.^ND. is necessary for the combustion of apound of coal in a locomotive fire box? A.—It takes pounds of oxygen toburn one pound of coal into carbondioxide. It takes pounds of air tosupply one pound of oxygen, thereforeit will take 1154 pounds of air to providethe oxygen necessary to burn eachpound of coal. As some excess of airis necessary, 20 pounds of air should beadmitted to the fire for each pound ofcoal to be burned, one pound of air fillsabout 13 cubic feet at ordinary tempera-tures, so we have 13 x 20 = 260 equal to260 cubic feet of air needed for everypound of coal burned. 19. How many cubic feet of air, there-fore, would be necessary for the burn-ing of a fire of four scoopfulls, assum-ing each scoopful to weigh ten pounds? A.—For four scoopfuls of coal, eachweighing ten pounds, the quantity of air coming in contact with the cyli
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