CATALOG OF THE MECHANICAL COLLECTIONS 49 



trie rod, which can be lifted out of engagement with the valve rod to 

 permit the valve to be worked by a hand lever provided for that 

 purpose. The speed of the engine was governed by a flyball throttling 

 governor, driven from a pulley on the shaft through belts to a jack- 

 shaft and then to the governor pulley. 



WILLIAM MONT STORM ENGINE, 1865 



U.S.N.M. no. 309195 ; original patent model ; transferred from the United States 

 Patent Ofl3ce; not illustrated. 



This model formed part of the application for the patent issued 

 to William Mont Storm on July 11, 1865, no. 48777. 



This is a 3-cylinder engine of a radial type, designed to produce 

 rotary motion with compactness and simplicity. 



The engine consists of two horizontal, opposed, single-acting cylin- 

 ders and one vertical double-acting cylinder. The pistons of the hori- 

 zontal cylinders are extended and joined to form a slotted crosshead 

 in which one crank of the crankshaft moves. The piston in the verti- 

 cal cylinder has a much shorter stroke and the piston rod from it 

 extends to a second cross head and crank. D -slide valves are operated 

 by a very small crank at the end of the crankshaft, in a valve chest 

 located at the center of the engine. The engine is reversible. 



WILLIAM SELLERS OSCILLATING ENGINE, 1872 



U.S.N.M. no. 251296 ; original patent model ; transferred from the United States 

 Patent OflBce; not illustrated. 



This model formed part of the application for the patent issued to 

 William Sellers, of Philadelphia, Pa., June 11, 1872, Patent no. 

 127928. 



This engine provides an oscillating engine valve gear capable of 

 variable motion and an adjustable guide that relieves the piston-rod 

 stuffing box of the wear and strain developed in rotating the crank. 



The engine is operated by a plain D-slide valve that receives a 

 constant motion, for giving a uniform lead, from the eccentric and a 

 variable and reversible motion, for cutting off the steam at different 

 portions of the stroke, and for reversing the movement of the engine, 

 from the oscillation of the cylinder. 



This is not the first oscillating engine in which the valve was 

 operated by the combined motion of the eccentric and the movement 

 of the cylinder. 



The piston rod guide is a sleevelike bearing cast in a piece with the 

 cylinder head and surrounding but separate from the stuffing box. It 

 is designed to prevent wear and leakage of the packing and permit 

 oscillating engines to run at high speeds. 



