BOILEE No. 62. 



213 



The ratio of water heating surface to grate surface in this 

 boiler is small, and, as a consequence, the products of com- 

 bustion escape to the chimney at a high temperature, and the 

 economic result is inferior to that obtained where these condi- 

 tions are more favorable. 



Boiler No. 62. 



Kind of boiler, Cast-iron sectional. 



Number used, Ten. 



Horse-power (collective, basis 12 square feet), Four hundred and sixty. 

 Kind of coal, ....... Anthracite Chestnut No. 2. 



Age, Twelve years. 



BOILER No. 62, GROUND PLAN SHOWING LOCATION OF BOILERS 

 AND FLUE HEATER. 



Boiler No. 62 embraces a plant of eight cast-iron sectional 

 boilers, a ground plan of which is shown in the following cut. 

 The individual boilers are of the same general form as that 

 shown in elevation in the cut of Boiler No. 61. In these 

 boilers a line of horizontal plates, or shields, is introduced 

 between the sections, along the water line, in order to separate 

 the space above the water line from that below it, and cut off 

 the steam heating surface. The total area of surface both 

 above and below the water line amounts to 850 square feet in 

 each boiler, and of this, approximately 548 square feet lies 

 below the shields, The upper ends of the boilers are not 

 sufficiently covered with brick work to wholly protect the iron 

 work of the upper sections. The brick walls of the settings 

 are unsound, and many small openings are thus provided for 



