46 BOILER TESTS. 



the other cases the evaporation is less than that of anthracite 

 coal; that of chestnut coal is 4 per cent, less; pea coal 9.5 

 per cent. ; mixture of pea and dust and Cumberland 4.2 per 

 cent. : mixture of pea and dust and culm 8 per cent. ; Nova 

 Scotia culm 14 percent. 



Proceeding farther, let us examine the subject from the 

 financial standpoint and make a comparison on the basis of 

 cost. Two elements must be considered here, viz., cost of 

 fuel and cost of labor ; both vary for the different fuels. 

 Take the case of a plant of 1 ,000 horse-power. According to 

 the standard of horse-power used in the paper, the daily pro- 

 duct of steam for ten hours' run of such a plant is 344,721 

 pounds, assumed to be evaporated from and at 212 degrees. 

 The number of tons of the various kinds of coal used per day, 

 computed from this quantity, are given in Table No. 8. This 

 table also contains the prices of the various coals, found by 

 taking an average of the present (October, 1888,) quotations 

 for a cargo delivered in the cities of Lawrence, Fall River and 

 Waltham ; and farther, the total cost of coal for one day's run 

 at the prices named. The table also gives the cost of labor 

 required in firing, the assumption being made in the case of 

 anthracite coal of broken, chestnut or pea sizes, that the labor 

 is performed by two day firemen, one night fireman and two 

 helpers, and in the case of bituminous coals that one additional 

 fireman is required ; while in that of the mixed fuels, one 

 fireman and one helper additional are required. The wages of 

 the firemen are assumed to be $1.75 per day, and of helpers 

 $1.25 per day. Finally, the table gives the total cost of fuel 

 and labor for the day's run of ten hours, computed in accord- 

 ance with the assumptions named. 



It appears from Table No. 8 that at the prices named there 

 is a difference in the cost of coal and labor for a day's run on 

 a 1,000 horse-power plant, reckoned between the highest and 

 lowest quantities, of $41.27. The significance of this sum is 

 apparent when it is considered that in a year's time it repre- 

 sents $12,711. Such a sum has no small relation to the total 

 amount of profit which a mill employing a 1 ,000 horse-power 

 plant realizes. 



