50 BOILER TESTS. 



used. These were made on boilers No. 34 and No. 39, and the 

 conclusion drawn from the results is that this coal under favor- 

 able circumstances gives about the same evaporation per 

 pound of fuel as anthracite broken coal. 



From the indication of a single test, made on Boiler No. 37, 

 the performance of Ohio lump coal with favorable conditions 

 appears to fall about 5 per cent, below the economy of anthra- 

 cite broken coal. 



Two tests are given which show the performance of coke, 

 that is, the refuse coke of gas retorts used in the manufacture 

 of illuminating gas. Test No. 95, made with coke on a plain 

 cylinder boiler, gave 8 per cent, less evaporation per pound of 

 fuel than anthracite pea. Test No. 67, made with coke on a 

 horizontal tubular boiler, gave 14.7 per cent, less evaporation 

 per pound of fuel than a high grade of Cumberland coal. The 

 cost of the coke was $3.00 for 2,000 pounds. 



Three tests give information upon the use of petroleum for 

 fuel. Test No. 24, made with petroleum, under somewhat 

 unfavorable conditions, gave an evaporation of 11.96 pounds 

 of water from and at 212 per pound of petroleum. Test No. 

 77 with "residuum" of petroleum gave 13.66 pounds. A 

 test with Canadian oil gave 15.00 pounds. Suppose the last 

 figure can be realized in good practice. At this rate, the 

 quantity of oil required to produce 1,000 horse-power for a 

 day's run of ten hours (344,721 pounds from and at 212 

 degrees) is 22,981 pounds, or 3,536 gallons (1 gallon = 6.5 

 pounds). The price of oil per gallon, required to make the 

 cost for a day's run equal to that of, say Cumberland coal, 

 may be figured from Table No. 8. The total cost of fuel and 

 labor given for Cumberland coal (the price being $4.56 per 

 ton) is $72.88. The cost of labor when oil is used is reduced 

 to, say one man at $2.00 per day and a helper at $1.25, 

 making a total of $3.25. Substract this from $72.88 and there 

 is left for the cost of fuel $69.63, which is 1^, cents per 

 gallon of petroleum, or 98.5 cents per barrel of 50 gallons. 

 This means, in round numbers, that the price of oil must be 

 less than one dollar per barrel, delivered at the boiler, in 



