INDEX. 249 



Effect of flue heater on draught, 58. 

 Effect of flue temperature on economy, 26, 28. 



Effect of proportion of tube area to grate surface upon economy, 34. 

 Effect of size of shell upon economy, 34. 

 Effect of size of tubes upon economy, 35. 

 Engineering tests and commercial tests, 11, 12. 



Escaping gases, Economical temperature of, with Anthracite and bitumin- 

 ous coal, 28. 



Feed water heated by coil of pipe in flue, 76, 221. 



Feed water, Method of weighing, 15. 



Fire box vertical boilers, 27, 187, 203, 208. 



Flue heater, Boilers with, 142, 171, 205, 213, 224. 



Flue heaters, Economy of, 56, 145, 174, 207, 226. 



Flue heater with cast-iron sectional boilers, 213. 



Flue heater with horizontal tubular boilers, 142, 171. 



Flue heater with vertical tubular boilers, 205. 



Flue heater with water tube boilers, 224. 



Flue temperature, Effect of, upon economy, 28. 



Forced draught, Boilers provided with, 70, 75, 86, 190. 



Free burning coal, 145, 152. 



FuTiiace for burning bituminous coal without smoke, 136. 



Galloway boiler, 180. 



Galloway boiler, Comparative economy of, 42. 



Gases, Economical temperature of, with Anthracite and bituminous coal, 28. 

 General conditions under which tests were made, 12, 13. 

 General conditions which secure economy, 28. 



Grates with 50 per cent, air space, vs. grates with 60 per cent, air space, 

 Economy of, 95. 



Hand regulation vs. automatic regulation of draught, 60, 94. 



H?ated air above fuel, Boiler supplied with, 84. 



Heating feed water by coil of pipe in flue, 76, 221. 



High flue temperature in cast-iron sectional boilers, plain cylinder boilers, 



and Galloway boiler, 31. 

 High flue temperature in vertical boilers, 26. 

 High water in vertical boiler, Economy of, 187. 

 Horizontal direct tubular boiler with common furnace, 105. 

 Horizontal direct tubular boiler with detached furnace, 86, 149. 

 Horizontal return tubular boiler, 42 inch, 154, 156. 



Horizontal return tubular boiler, 48 inch, 67, 78, 92, 96, 102, 104, 129, 136. 

 Horizontal return tubular boiler, 54 inch, 81, 145. 

 Horizontal return tubular boiler, 60 inch, 113, 123, 131, 157. 

 Horizontal return tubular boiler, 66 inch, 138. 

 Horizontal return tubular boiler, 72 inch, 127, 134, 152. 

 Horizontal return tubular boiler with additional pipe surface in furnace, 67, 



142. 



