U. S. NATIONAL MUSEUM 



BULLETIN 173 PLATE 3i 



Internal-combustion engines. 



1. Hornsby-Akrovd oil engine, 1893-1895 (U.S.N.M. no. 309637. See p. 157. 

 2. Charles Manly radial engine, 1901 (U.S.N.M. no. 248651). See p. 158. 



