Re POET OF Judges ox Pujrrs, cfjc. 81 



2t1. The sccoml trial M'as to <leterniiiie the maxiiiinni rate of dis- 

 charge. On tlie said trial tlie Kiiowles pninji slio^ved itself su])erior, 

 delivering nearly as much water Avith a water-cylinder six inches in 

 diameter as the JS^iagara did with a seven inch cylinder. 



8(1. The third test was to deternune the minimum capacity. On 

 the said trial the Niagara pump appeared superior, wdiich, we are 

 informed, was due to the fact that the two pumps did not have the 

 same method of throttling the water discharge. We have ourselves 

 repeated this test several times, and tind the Knowles pump far 

 superior to the i!S^iagara, in fact, the Niagara pump would stop 

 entirely "when we attempted to run it verv slowly. 



4th. The fourth test was to ascertain the time required to show 

 the pump valves. On the said trial the Niagara pump was far supe- 

 rior, l)ut the Knowles pump has since such trial (1807) been improved 

 in this respect, so that the valves are sufficiently accessible for any 

 purpose, the openings are large and direct, and the valve seats may 

 be readily reached for repairs, and various materials may be used for 

 the valves so as to adapt them for ])umping all kinds of liquors. "We 

 therefore consider that, taken as a whole, the pump end of the 

 Knowles pump, is superior to that of the Niagara. 



5th. The fifth test relative to the construction of the steam valves 

 and piston, has already been referred to when discussing the first 

 point. We vrill however add to what Ave have already said, that in 

 our judgment the steam end of the Knowles pump, taken as a whole, 

 is far superior to that of the Niagara, 



We therefore consider that the Knowles direct-acting steam pump 

 is, as at present constructed, far superior to the Niagara direct-acting 

 steam pump, on every point made by the jndges on the trial of 1807. 

 In fact, it appears that whilst Messrs. Knowles & Sibley have 

 inqn-oved their pump in the means of access to the water valves. 

 Ilardick has allowed his workmanship to fall behind, as evidenced by 

 oui- test at slow speed. 



AVe will now refer to the written statements or points presented by 

 the exhil)itors themselves. 



Messrs. Knowles & Sibley claim for their pump 



"1st. A perfectly positive valve either Avith water, air, or steam 

 pressure." [AlloAved. True, also, of IMake's punq). Not true of 

 the Niagara or Hardick pump on exhiljition.] 



" 2d. That our main valve is a plain slide valve, always Avearing 

 CA-enly and tightly, and is the best knoAvn and most easily repaired," 

 [Lnst.] 6 



