110 TRANSACTIONS OF THE 



The course of the flame and draft is from the grate to the upper 

 part of the furnace and into the gas chamber, thence down through 

 vertical tubing to the ash pan, thence along and up through tubing 

 and the chimney hole of the diaphragm, thence horizontally to the 

 chimney. 



The tubing of this boiler is not liable to become clogged nor be 

 destroyed by the direct action of the heat, the arrangement being 

 a large number of short vertical tubes instead of a small number 

 of long horizontal ones as in common locomotives. 



The use of coal as fuel for locomotives is now attracting much 

 attention; its importance is seen from the fact that estimating a 

 ton of coal and a cord of wood at the same price, the cost of fuel 

 is reduced full fifty per cent by the successful use of coal instead 

 of wood. 



There are several reasons why coal cannot be used with advan- 

 tage in common wood engines; the most important being the de- 

 struction, in a short time of the tube sheet, tubing and interior of 

 the furnace; the liability of the tubing to clog with fine coal, and 

 the escape of a large portion of the fuel in the form of smoke and 

 gas; which objections are claimed to be entirely overcome in the 

 use of the'locomotive under consideration. 



From several certificates in relation to this coal burner before 

 us, we select the following from Mr. John B. Winslow, Superin- 

 tendent of the Boston and Lowell railroad : 



Boston, March 6, 1858. 

 I have been acquainted with the Boardman Coal Burning Lo- 

 comotive Boiler for the last three years. I consider it superior to 

 any coal burning locomotive that I am acquainted with. The one 

 that we have in use has given entire satisfaction in all respects. 

 The following is the cost per mile for running with coal for the 

 months of December 1857, and January 1858. The coal costs per 

 2,240 pounds, on the tender, $6. 



December, cost per mile for fuel, lOrVo I 



January " ' « 9 ,Vo i ^ 



