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POPULAR SCIENCE MONTHLY. 



The boiler is a very compact form of the upright type, such as is 

 used in fire engines. It is about fourteen inches in diameter and twenty 

 inches high. To increase its strength, it is surrounded with two layers 

 ■of piano wire. The engine is of the locomotive type, consisting of two 



Fig. 15. Sectional View of Fig. 14, Showing Location of Engine, Boiler and 

 Other Details. 



cylinders, the pistons of which are connected with cranks on the end 

 of the shaft, these cranks being set at right angles, so as to prevent 

 catching the engine on the dead center. The direction of rotation is 

 reversed by means of the ordinary link motion. The fuel used is 



1.610 j 



Fig. 15A. Plan of Steam Carriage Shown in Figs. 14 and 15. 



gasoline, which is carried in the cylindrical tank located under the 

 front of the carriage. The gasoline is vaporized and then, mixed with 

 a proper proportion of air, passes to a burner placed under the boiler. 

 The amount of steam generated is regulated by the amount of gasoline 



