186 



ENGINE TESTS. 



Measurements Based on Sample Diagrams. Engine No. 47 



Engine No. 47 is a horizontal tandem compound, with 

 jacketed cylinders and a reheater. The condenser is of the 

 siphon type with water supplied by gravity. The jacketing 

 applies to heads and barrel of the H. P. cylinder, and to the 

 heads but not the barrel of the L. P. cylinder. The reheater is 

 of the tubular type, and contains a sufficient area of surface to 

 superheat the steam passing to the L. P. cylinder, although 

 some of that entering the heater remains in a condensed 

 state, and is drawn off by a trap. The valves are all of the 

 gridiron type. The steam is furnished by horizontal tubular 

 boilers, and it was found by calorimeter test to be practically 

 dry. The valves and piston of the H. P. cylinder were found 

 in good condition. The steam valve at the head end of the 

 L. P. cylinder leaked badly, and the crank-end valve a consid- 

 erable amount; but as near as could be judged under these 

 circumstances the exhaust valves and piston were fairly tight. 

 The load was cotton machinery. Three tests were made with 

 different receiver pressures, and one test was made with 

 steam shut off from jackets and reheater. 



On test B the water condensed in the jackets and reheater 

 tubes amounted to 681 Ibs. per hour, or 7.7% of the total. 

 This is included in the total quantity given in the table. 



