304 cox. 



cleaned before beginning tlie test; it was in all cases used on the previous 

 day so that the brickwork was thoroughly heated, and it was under full 

 steam for some time on the day of the test before beginning the actual 

 run. The gauge glass of each boiler was graduated into millimeters and 

 calibrated independently with water at 30° C. These data were used to 

 correct the water level between starting and stopping rather than by use 

 of. the pump. 



BOILEE : 



Khid, Babcock and Wilcox. 

 Nominal rating, 75 horsepower. 

 Type, water tube. 

 Tubes : 



Number, 45. 



(external, 10.16 centimeters. 



linternal, 9.48 centimeters. 



Length exposed, 42.67 decimeters. 



Drum : 



Diameter, external, 9.15 decimeters. 



Length, external, 5S.4 decimeters. 

 „-,,.. , Square 



W ater-heatmg surface — decimeters. 



Of tubes : 5,715.2 



Of drum 748.8 



Total 6,464.0 



Steam gauge, Aslieroft's, graduated to 5 pounds on a 12-incli dial. 

 Furnace : 



Kind, Hand fired. 



. f front, 12.2 decimeter's. 

 Iback, 8.3 decimeters. 

 Width, 9.90 decimeters. 

 Flue connecting to chimney: 

 Length, 18.3 decimeters. 

 Calorimeter, 49.4 square decimeters. 

 Grate : 



Kind, gridiron bar or perforated as best adapted to the in- 

 dividual coal. 

 Width, 9.90 decimeters. 

 Length, 18.3 decimeters. 

 Area, 181.2 square decimeters. 

 Ratio of water heating surface to grate surface, 35.7: 1. 

 Chimney : 



Diameter, internal, 12.2 decimeters (4 English feet). 

 Height above grate, 30.5 meters (100 English feet). 

 Area, 38.33 square decimeters. 



The stack was high enougii in all cases to give the draft necessary 

 for the coal in the condition used. 



Draft, natural. 



We have no economizer. 



The exhaust main passes through a 200-horsepower Wainwright 

 even-flow feed-water heater. 



