Figure 29. — Details of the Valve Gear (figs. 6 and 7) and the boiler 

 (figs. 8 and 9) as shown in the 1 847 British patent. Neither the boiler 

 nor this valve gear with its curious Scotch yoke was shown in the U.S. 

 patent. Note the use of baffle plates in an attempt to maintain a constant 

 water level in the boiler. 



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