Figure 35. — Top View of the 1850 Patent Model with 

 boilers removed, showing the mounting levers, the counter- 

 shaft and its cranks set at 90°, the four crossheads, and the 

 connecting rods. (Smithsonian photo 46884-C.) 



had observed, was able to keep water over the crown sheet re- 

 gardless of the grade. 



Rearrangement of the machinery from an outside to an inside 

 connection had been proposed in the columns of the Scientific 

 American as early as the time of the New York trial. ^i^ Sellers 

 apparently had worked out this modification by the time the new 

 boiler was devised, for he included both ideas in his petition (Feb- 

 ruary 20, 1849) for a new patent. It was issued on July g, 1850, 

 as U.S. patent 7498. The original patent model is now in the 

 collections of the U.S. National Museum and is pictured in figures 

 345 35. and 36. 



^^ (August 19, 1848), vol. 3, p. 380. 



74 



