U. S. NATIONAL MUSEUM 



BULLETIN 173 PLATE 28 



STEAM Pumps. 



I. Worthington direct-acting steam pump, 1855 (model; U.S.N.M. no. 309245). See p. 133. 

 2. Cameron pump valves, 1874 (model; U.S.N.M. no. 308686). See p. 135. 



