86 



ENGINE TESTS. 



type with ring packing. Steam is supplied by a vertical boiler 

 having only a small amount of steam-heating surface. At a 

 point near the throttle valve a calorimeter test showed the 

 presence of 3% of moisture, no allowance for which is made 

 in the record of results. The pistons were practically tight. 

 The valve leaked a small amount. The load consisted of a 

 Prony brake applied to the fly-wheel. 



The tests were three in number, made with different loads. 



In these tests it appears that the economy of the engine was 

 not materially affected by reducing the load from 44.81 H. P. 

 to 35.08 H. P. A further reduction, however, increased the 

 consumption. 



In connection with this series of tests, experiments were 

 made on the effect of a reduction of speed. It was found that 

 with a speed of 201.1 revolutions per minute, the steam con- 

 sumption per horse power per hour was increased 10 per cent. 



ENGINE No. IGa 



80- 

 60- 

 40- 

 20- 



0- 

 80- 

 60- 

 40- 

 20- 



O- 



R.H. Cyl, 



L.H.Cyl. 



