CATALOGUE OF THE MECHANICAL ENGINEERING COLLECTION. 47 



one cam, each rod operating two valves. The valves closing out- 

 wardly are held shut by centrifugal force, which also opens the inlet 

 valve by its action on the valve rods. No throttle control is used, 

 but the control consists in regulating the closing of the inlet valve 

 so as to retain only the required charge of gasoline in the cylinder, 

 allowing the balance of the gasoline to be drawn in by the next cyl- 

 inder. 



The cylinders are 4^-inch bore and 3^-inch stroke, developing 36 

 horsepower at 1,500 revolutions a minute, the maximum speed. Total 

 weight is about 97 pounds, equal to about 2.7 pounds to the horse- 

 power. 



FIG. 20. HAYNES SIX-CYLINDER AUTOMOBILE ENGINE, 1914. 



This motor was used by Mr, Emile Berliner, of Washington City, 

 in helicopter experiments during the years 1907-8. 



Cat. No. 276,602 U.S.N.M. 



Six-Cylinder Gasoline Motor. Made and Presented by the Haynes Auto- 

 mobile Co., 1914. 



This is an example of the " power plant " designed for use in 

 certain of the automobiles built by the Haynes Co. in 1914. Selected 

 portions of the motor have been cut away so as to show the working 

 parts in operative relation. 



The engine has six water- jacketed L-head cylinders, 4|-inch bore 

 and 5^-inch stroke, cast in pairs and bolted to the crank case. The 

 intake and exhaust valves are on the same side of the cylinders, the 



