by Baldwin in late 1847 and placed on the road in January 

 1848. All had an 0-8-0 wheel arrangement, and were in- 

 tended for heavy-duty work with freight trains. The general 

 design of these locomotives had been originated by Baldwin 

 in 1846 in an order of freight engines built by him for the 

 Philadelphia and Reading. 



The Memnon type of engine had four coupled driving 

 wheels on each side, and early reports give their diameter 

 as 43 inches. Today's measurement of the Memnon reveals the 

 diameter of its wheels, undoubtedly replacements, to be only 

 41 inches. The wheels on the two center axles are unflanged, 

 the better to negotiate curves of limited radius with its wheel- 

 base of 135 inches (in 1847 the shortest curve on the B & O 

 had a 400-foot radius). 



The inclined cylinders have a 17-inch bore and a 22-inch 

 stroke, and the valve gear is of the Gooch stationary link 

 type. The Memnon is now operated on a steam pressure of 65 

 pounds per square inch, although it originally operated 

 on 100. 



Figure 59. — Recent photo of Memnon, built in 1848 by New Castle Manufac- 

 turing Co. 



72 



