. The Street railway journal . y be hoped for in this di-rection. On the other hand, there is still room for largegains in economy in the boiler room in generating thesteam required. From 20 per cent to 40 per cent of the heatdeveloped by the coal is still lost up the chimney, due to in- 20% 5/. P ER CEI VTA CE f— Ol - c I— AR Lr WD r- ox IDI 6 30 P | Percentage of loss t f rt-i un curve. z> now re 1 .1 oY 1. 1 air supplied1 to that 1 35 t eye at 1 26 —SHOWING RELATION BETWEEN THE LOSS OF HEAAND PER CENT OF CARBON DIOXIDE IN THECHIMNEY GASES judicious or careless firing. This loss can be re
. The Street railway journal . y be hoped for in this di-rection. On the other hand, there is still room for largegains in economy in the boiler room in generating thesteam required. From 20 per cent to 40 per cent of the heatdeveloped by the coal is still lost up the chimney, due to in- 20% 5/. P ER CEI VTA CE f— Ol - c I— AR Lr WD r- ox IDI 6 30 P | Percentage of loss t f rt-i un curve. z> now re 1 .1 oY 1. 1 air supplied1 to that 1 35 t eye at 1 26 —SHOWING RELATION BETWEEN THE LOSS OF HEAAND PER CENT OF CARBON DIOXIDE IN THECHIMNEY GASES judicious or careless firing. This loss can be reduced to aminimum only by having a positive control over the firemanand by giving him the means of knowing the condition of hisfire at all times, thus enabling him to supply the coal and reg ulate the air in such a manner that maximum efficiency results. The best index of efficiency for the furnace of a steamboiler is the percentage of carbon dioxide (COa) in theproducts of combustion. It is of easy calculation to deter-. FIG. 2.—SINGLE TYPE OF GAS COMPOSIMETER mine how the loss up the chimney increases as the C02 inthe products of combustion decreases. Fig. 1 graphicallyillustrates the relation between the loss of heat, i. e., wasteof fuel, and the per cent of C02 in the chimney gas. Thelogical conclusion is, therefore, that if the CO., containedin the products of combustion can be continuously observedthe fire can be so regulated that maximum efficiency instruments have been devised to indicate continu-ously the CO.,, others to record the same, but none of these,it is claimed, accomplishes the two important results securedby the Uehling gas-composimeter, namely, that the firemanshall at all times be able to see what he is doing in the way ofefficient firing, and the superintendent have a continuousrecord of what he did-—and thus have a check on his gas-composimeter indicates the CO., at the boilerfront or other conspicuous place for t
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
