ENGINE No. 71. 



Four valve, 14" x 35". Speed, 49 revolutions per minute. 



This engine has two double-poppet steam valves, and slide 

 valves for the exhaust; all driven through a train of gears. 

 The changes consisted in moving the stem of the steam valve 

 in so as to clear the driving-cam, and setting the gear forward 

 on the shaft 2 teeth. The diagrams were taken from the head 

 end, No. lla before, and No. 71& after, the adjustments. 



ENGINENo. 71a 



ENCINENo. 71b 



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