U. S. NATIONAL MUSEUM 



BULLETIN 173 PLATE 20 



Engine indicators. 



1. McXaught, c. 1835-1842 (U.S.N.M. no. 307516). See p. 91. 

 2. Richards, c. 1867 (U.S.X.M. no. 307515). See p. 92. 

 3. Crosbv, 1879 (model; U.S.N.M. no. 308701). See p. 92. ^ 

 4. Indicator with continuous card appliance, 1930 (U.S.X.M. no. 3098.^4). bee p 



94. 



