. Journal of electricity. es the loss due to unconsumed hy-drogen, and if accurate tests are made it will be foundthat this item is always greater the more CO is foundin the gases. If the furnace is properly designed it should bepossible to secure 13^4% to 14% CO,, with not over3% oxygen, and without a trace of CO, using not over15% or 20% excess air. These results must be se-cured to give the best economical results, and if theycannot be secured by changing the draft or the burn-ers, it will then follow that there is something wrongwith the furnace arrangement. 458 JOURNAL OF ELECTRICITY [Vol
. Journal of electricity. es the loss due to unconsumed hy-drogen, and if accurate tests are made it will be foundthat this item is always greater the more CO is foundin the gases. If the furnace is properly designed it should bepossible to secure 13^4% to 14% CO,, with not over3% oxygen, and without a trace of CO, using not over15% or 20% excess air. These results must be se-cured to give the best economical results, and if theycannot be secured by changing the draft or the burn-ers, it will then follow that there is something wrongwith the furnace arrangement. 458 JOURNAL OF ELECTRICITY [Vol. 40—No. 9 It will be found that there is a very intimate rela-tion between the furnace, the burner, and the the intensity of draft and amount of atomizingsteam that give best results with one furnace, maygive poor results with another; yet by readjusting thedampers and burner valves to suit the new conditions,better results than ever may be obtained. With toomuch steam the flame may be carried too far beyond. A TYPICAL AUTOMATIC SYSTEM OF CONTROL Diagramatic View, showing Manner of Control for the Oil, theAshpit and the Damper: A. Master Controller B. Single Bearings I. Damper Weights B. Double Oil Strainer F. Damper Arms J. Interlocking Damper C. Oil Gage G. devices K. Special Brackets D. Regulator H. Damper Hubs the air openings, causing a poor mixture of air andgases. This would result in a poor gas analysis, al-though the total quantity of air may be correct. There are so many variations that can be made,that it is usually impractical to make a completeevaporative test for each set of conditions. It is pos-sible, however, to obtain comparative data in a singletest, by varying the conditions at the end of each hour,or each two hours. By carefully observing the quan-tity of oil and water used each hour, a fairly accuratecomparison of efficiencies under different conditionsmay be obtained. This, combined with the flue gasanalysis, makes a valuable guide for effic
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