ENGINE No. 84. 



Four-valve cross compound, 17 '" and 28" x 48". Speed, 

 100 revolutions per minute. 



This engine is a non-condensing compound. The valves are 

 all slide valves, and the steam and exhaust are operated by in- 

 dependent eccentrics. The diagrams show the effect produced 

 by changing the cut-off on the low-pressure cylinder, and there- 

 by the pressure in the intermediate receiver. Diagram 84 a 

 was taken with a receiver pressure of 44 Ibs., and diagram 

 84 b with a receiver pressure of 27 J Ibs. They are all from the 

 crank end. 



309 



