ENGINE No. 95. 



Diagram No. 95 is from the steam pipe of a 20" x 50" four- 

 valve engine making 65 revolutions per minute. 



-70 

 -60 

 -60 

 -40 

 -30 

 -20 

 - 10 

 



The pipe is 5" in diameter and 36' long, and it contains 4 

 short right-angle elbows. This is the same engine as the one 

 numbered 76 under the head of Valve Setting. The features 

 in this diagram conform in the main to wh.it would be expected 

 from the known operations of the steam. 'Hie pressure drops 

 at the beginning of the stroke, and rises at the point of cut- 

 off; and when the opposite end of the stroke is reached it drops 

 again, coincident with the opening of the steam valve, and 

 rises again when the cut-off at the other end takes place. < >ne 

 feature here is noticeable; and that is, that the effect of the 

 subsequent admission after the cut-off, which is shown on the 

 diagram taken from the cylinder, the same as in NO. 7<J. is 

 clearly revealed on the steam-pipe diagram, where there is a 

 second fall of pressure just beyond the point where the rise 

 occurs due to the regular cut-off. The fall of pressure eom- 

 mencing at the middle of the stroke and continuing to near the 

 end is a feature of this diagram the same as in some of the 

 preceding ones which have been referred to, though here it 

 takes place more gradually than in some. 



332 



