U. S. NATIONAL MUSEUM 



BULLETIN 173 PLATE 32 



8623A: 1W98A 



Internal-combustion Engines. 



1. Otto 4-stroke cvcle engine, 1877 (model; U.S.X.M. no. 251284). See p. 153. 

 2. Otto gas engine, 1882 (U.S.N..M. no. 309556). See p. 156. 



