THE ENGINE PROPER 



Center-Head Packing. Leakage around the rod, be- 

 tween the two cylinders, is prevented by metallic packing, 

 which, with sufficient lubrication and clean water in the 

 boiler, will re- 

 main tight dur- 

 ing the life of 

 the engine. The 

 ace ompanying 

 cuts show a side 

 and a sectional 

 view of the me- 

 tallic piston-rod 

 packing which 

 is located in the FIG - 2 ?- THE CENTER-HEAD PACKING. 



center-head between the high and low-pressure cylinders. 

 In the side view, the rings G and B are removed. The 

 center-head is represented by A. The iron-packing rings 

 D and E are each in three parts or segments and are held 

 in their proper places by the spring C. These segments of 

 rings are so placed that they "break joints," as can readily 

 be seen from the side elevation. They are held in position, 

 relative to each other, by the dowel pin, H. These packing 

 rings are held in place by the ring B, and also by the ring 

 G, which is fastened to the head with three cap-screws, F. 

 The head is held in its position between the cylinders by 

 set-screws, as can readily be seen from Fig. 24. 



To Test the Center-Head Packing, set the reverse lever 



