ENGINE No. 48. 



191 



Measurements based on Sample Diagrams. 



Engine No. 48 is a horizontal cross compound, with un- 

 jacketed cylinders and a reheating receiver. The valves are 

 plain slides. The condenser is of the jet type with steam- 

 driven air-pump, the steam used for which was determined 

 and allowed for. The boilers are of the vertical fire-tube type, 

 furnishing slightly superheated steam. The crank end exhaust 

 valve of the H. P cylinder leaked considerably, but with this 

 exception the valves and pistons were practically tight. The 

 load was cotton machinery. 



A comparison of tests A and C shows the effect of two 

 widely different pressures upon the economy, one being 125.9 

 Ibs., arid the 'other 100.2 Ibs. The reduction of pressure in- 

 creased the consumption from 14.12 Ibs. per L H. P. per hour 

 to 15.08 Ibs., or nearly 7 %. 



Test B as compared with test A exhibits the effect of 

 shutting off the reheater. There is a slight loss of economy ; 

 but as the difference is within the limits of errors of measure- 



