APPENDIX. 197 



Efficiency. 

 (See Art. XX, Code.) 



67. Efficiency of the boiler ; heat absorbed by the boiler per Ib. 



of combustible divided by the heat-value of one Ib. of 

 combustible.* per cent. 



68. Efficiency of boiler, including the grate ; heat absorbed by 



the boiler, per Ib. of dry coal fired, divided by the heat 

 value of one Ib. of dry coal.f 



Cost of Evaporation. 



69. Cost of coal per ton of 2240 Ibs. delivered in boiler-room... $ 



70. Cost of fuel for evaporating 1000 Ibs. of water under ob- 



served conditions $ 



71. Cost of fuel used for evaporating 1,000 Ibs. of water from 



and at 212 degrees $ 



Smoke Observations. 



72. Percentage of smoke as observed. 



73. Weight of soot per hour obtained from smoke-meter. 



74. Volume of soot obtained from smoke-meter per hour 



* In all cases where the word " combustible " is used, it means the coal without moisture 

 and ash, but including all other constituents. It is the same as what is called in Europe " coal 

 dry and free from ash." 



t The heat value of the coal is to be determined either by an oxygen calorimeter or by cal- 

 culation from ultimate analysis. When both methods are used the mean value i to be taken. 



