ENGINE No. 88. 



Marine triple expansion engine, 15", 23", and 40" x 30". 

 Speed, 83^ revolutions per minute. 



These diagrams show the effect produced by leakage of the 

 low-pressure piston. The dotted line on the low-pressure dia- 

 gram is the one taken when the leakage was going on, and the 

 full line the one taken with a tight piston. The diagrams SSa 

 from the intermediate and high-pressure cylinders are those 

 taken with the tight engine. The effect of stopping the leak- 

 age, which was due to the weakness of the springs under the 

 packing-rings, was to raise the pressure in the receiver. The 

 increase was 4 Ibs. Another effect was to increase the speed 

 of the engine when running at full capacity from 81 revolutions 

 per minute to 84. Still another effect was to increase the power 

 developed from 410 I. H. P. to 442 I. H. P. 



ENGINE No. 88a 



H.P. Cyl. 



140- 



120- 



100- 



80- 



60- 



40- 



20- 



0- 



ENGINENo. 88b 

 L.P. Cyl. 



5- 

 0- 

 6- 



10- 



317 



