152 



BOILER TESTS. 



a net evaporation of 15 pounds of water from and at 212 

 degrees per pound of oil. The boiler used in this case was of 

 the ordinary horizontal tubular type, 6 feet in diameter and 

 14 feet long. It contained 71 four-inch tubes, and the ratio 

 of heating surface to grate surface was 39 to 1. 



O o 



Boiler No. 37. 



Kind of boiler, ...... Horizontal return tubular. 



Number used, ...... One. 



Horse-power ( basis 12 square feet ), . .Ninety-five. 



Kind of coal, ...... Bituminous Ohio Lump. 



Age, ........ Several years. 



Boiler No. 37 is an ordinary horizontal tubular boiler set in 

 brick work in the general manner shown in longitudinal sec- 

 tion in the following cut. The fire door admits a large amount 

 of air into the furnaces above the fuel, being specially arranged 

 for this purpose. 





BOILER No. 37, LONGITUDINAL SECTION. 



