40 



BULLETIN 119, U. S. NATIONAL MUSEUM. 



and causes it to move upward. Upon completion of its upward stroke 

 the momentum of the balance wheel, which is connected by means of 

 a common crank and links to the piston, causes the piston to descend. 

 In its descent a cam on the main shaft, acting upon a lever, opens an 

 exhaust valve. Cat. No. 251,280 U.S.N.M. 



Model of Errani and Anders Petroleum Dynamic Engine, U. S. Patent, No. 

 140021, June 17, 1873. Transferred from United States Patent Office. 



The engine resembles an ordinary steam engine whose piston, how- 

 ever, is actuated by the expansive force resulting from the ignition 

 at the beginning of the " outstroke " of a mixture of petroleum and 



FIG. 15. ERRANI AND ANDERS OIL ENGINE, 187 



air sprayed into the cylinder through an aperture in its head. The 

 oil-spraying device operates on the same principle as that of the 

 household atomizer and cologne spray. Beneath the engine is an oil 

 tank from the bottom of which protrudes a vertical tube. This is sur- 

 rounded by an air chamber whose upper end terminates in a nozzle 

 opposite the aperature in the cylinder head. Blasts of air obtained 

 from a rubber bulb intermittently compressed by the action of a 

 plunger operated by a crank on the main shaft fill the air chamber, 

 forcing the oil up the tube and out of the nozzle together w4th air 

 into the engine cylinder. Upon the ignition of the oil by an electric 

 spark expansion moves the piston forward to the end of its stroke, 

 and the impetus thus given to the flywheel returns the piston to its 

 normal position ready for a repetition of operations. The quantity 

 of oil sprayed into the cylinder is regulated by a cock in the charging 

 pipe of the oil tank. When this cock is open all of the air forced 

 into the air chamber by the bulb compressor passes out of the oil tank 



