Smithsonian Report, 1918. — Leffmann. 



Plate 6. 



Fig. I — Five-Cylinder Gasoline Engine of 52 Horsepower at 950 

 Revolutions Per Minute. 



This engine, which was used in the full-size machine, was built in the Smithsonian shops under 

 Prof. Langley's direction and is now on exhibit in the National Museum. 



Fig. 2. — The Large Langley Flying Machine as at Present on 

 Exhibition in the United States National Museum. 



Near it (directly above the John Bull engine) is the quarter-sized model. 



