88 Transactions of the American Institute. 



pressure of sixty pounds; the pump to show the slowest practical 

 speed at which it can deliver water. 



FouKTH Trial. — To ascertain the time required to show the 

 pump valves: The trial commenced at a given signal, when the 

 pump was delivering water under pressure; one man then stopped 

 the pump, removed the bonnets, showed the valves, replaced tiie 

 bonnets, and started the pump again. Time was noted as soon aa 

 the joints proved tight under pressure. 



Fifth Trial. — To show the condition of steam valves and pistons 

 under the boiler pressure of sixty pounds, with the cylinder head 

 removed. 



The results of the five trials are condensed into the following 

 tables: 



