CATALOG OF THE MECHANICAL COLLECTIONS Igl 



ERICSSON HOT-AIR ENGINE, 1880 



U.S.N.M. no. 251286 ; original patent model ; transferred from the United States 

 Patent Office; not illustrated. 



This model was submitted with the application for Patent no. 

 226052, issued to John Ericsson, of New York, N. Y., March 30, 

 1880. 



In this engine a charge of air is repeatedly heated and cooled as 

 it is transferred from end to end of a single cylinder, one end of 

 which is surrounded by a furnace, the other end of which is water- 

 jacketed. The air expands and contracts beneath a work piston that 

 travels through a short stroke near the upper end of the cylinder. 

 The air is displaced from end to end of the cylinder at the proper 

 time by a large loosely fitting transfer piston independently con- 

 nected to the crankshaft. 



This model is similar in design to the pumping engine of 1906, 

 described below. 



ERICSSON HOT-AIR ENGINE, c. 1880 



U.S.N.M. no. 308142; original demonstrating model; gift of the American 

 Society of Civil Engineers ; not illustrated. 



This is a small demonstrating engine of the type patented by 

 John Ericsson on March 30, 1880 (see above) . 



This engine is equipped with a gas-heated furnace and has metal 

 radiating fins at the upper end of the cylinder in place of the usual 

 water jacket. 



A brass plate on the engine is inscribed : "To Mrs. E. W. Stoughton 

 from her friend John Ericsson." 



ERICSSON PUMPING ENGINE, 1906 

 Plate 36 



U.S.N.M. no. 309533 ; original ; gift of Jonathan Hagan ; photograph no. 39028-A. 



This is an 8-inch, i^-horsepower (120 revolutions per minute) en- 

 gine of the type patented by John Ericsson on March 30, 1880 

 (see above) . It was built by the Rider-Ericsson Engine Co. in 1906 

 and was used to operate a deep-well pump on the farm of the donor 

 until 1927. Wood was used for fuel. The engine is about 66 inches 

 high and has a 30-inch flywheel. 



The engine has a long slim vertical cylinder closed at the lower end, 

 with a short closely fitting work piston near its upper end and a largo 

 loosely fitting transfer piston below the work piston. The lower 

 end of the cylinder is surrounded by a furnace; the upper end is 

 cooled by a water jacket. The work piston and transfer piston move 



