ENGINE No. 54. 217 



Engine No. 54 is a vertical cross compound with unjacketed 

 cylinders. Each cylinder has a single balanced slide valve, 

 and the speed is controlled by a shaft governor operating on 

 the H. P. valve. The steam is drawn from water-tube boilers 

 through a considerable length of pipe, having headers and 

 separators which were thoroughly drained, and a calorimeter 

 attached near the engine showed that it was practically dry. 

 Steam condensed from the pipes was trapped and properly 

 allowed for. The load consisted of two dynamos located on 

 the engine shaft. The valves of both cylinders leaked a small 

 amount, and the piston of the H. P. cylinder leaked consider- 

 ably at full pressure. The low-pressure piston was tight. 

 Three tests were made with three different loads. 



In these tests there is substantial agreement between the 

 results of tests " B " and " C " ; the former being made under 

 conditions of a medium load, and the latter under what would 

 be considered an overload. This reveals the advantage of com- 

 pounding in engines of this class, where by this means the 

 benefits of expansion in the engine as a whole are realized with- 

 out suffering the losses produced in either cylinder due to 

 early cut-offs. 



