AMERICAN INSTITUTE. 



109 



Boardman's Coal Burning Locomotive. 



New- York and New Haven, New Jersey, Leliigh Valley and Illi- 

 nois Central. Tlie fuel used by it has been mostly bituminous 

 coal; althougli it is well adajDted for anthracite coal, and will burn 

 wood with many advantages over common wood locomotives. 



The principal advantages claimed for it by the inventer, are 

 economical use of coal without smoke or sparks and without 

 destroying the furnace and tubing; and placing a large portion of 

 the weight of the boiler near the track. 



The arrangement is as follows : The furnace is quite large, the 

 door grate, &c., being similar to those of common engines. A large 

 flue, called the gas chamber, extends horizontally from the upper 

 portion of the furnace over the tube box, to the front end of the 

 boiler; the bottom of which Hue is the upper tube shut; the lower 

 tiil:)8 shut being as low as the bottom of the furnace. 



An open space is left between the tube-box and the furnace for 

 the axle of the drivers, so that both the furnace and the tubing 

 portions of the boiler are jilaced near the track; thus insuring 

 steadiness in running, with much less injury to the road and the 

 locomotive than otherwise. The gas chamber is divided at about 

 two-thirds of the distance from the furnace to the front end ot the 

 boiler, by a hollow diaphragm, through which atmospheric air is 

 admitted into the gas chamber, and causes therein a perfect ccm- 

 bustiun of the smuke and combustiljle gases. 



