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Show lem Is to bum all of tho combustible with the least surplus of air. Low wages paid to firemen gets poor men, yet a man who knows how to Are a boiler right will save the amount of his wages over and over again." Partly because of the anti-smoke, crusade In Chicago, Mr. Hayes' invention has been put to practical use in that city with success that shows when it Is generally gener-ally used tho country's coal supply will last longer than Is now promised by the methods In general ubc According to figures of the conservation commission, commis-sion, tho country's coal mines will bo exhausted by tho end of the next century cen-tury unless we slow up In the reckless reck-less waste of fuel, get more horsepower horse-power out of every carload and devise more economical methods of power production. ' SAVING COAL. Tho nation's Inroads upon its coal pile by the wasteful methods of mining and still more wasteful methods of using fuel has added a novel step in exact sclenco toward the conservation of coal, now 95 per cent wasted in the processes of producing power. A device de-vice has been perfected by the latest type of specialist, the "combustion engineer." en-gineer." with which one Is enabled to learn what gases aro present in a furnace fur-nace and what ones go up the chimney and thus determlno why a chimney belches soot, how many heat units are wasted, and why, so that more power can be produced from tho coal consumed con-sumed than has been the common practice. prac-tice. "The field of flue gas analysis Is as yet an unexplored territory to most ! of us," said the Inventor of this device, Jos. W. Hayes, of Rogers Park, III., who was called upon to explain to Chicago's Chi-cago's Smoko Commlkislou why tho city is deluged with uncousumed particles par-ticles of coal in spite of efforts made in good faith to check tho waste. In a monograph on "How to Build Up Furnace Fur-nace Efllciency," which authorities re-gard re-gard as tho last word on this very practical prac-tical subject. "he paid: "There are dollars to be saved at tho furnace, and only dimes at tho engine. Tho prob- |