Reports of Judges. 93 



Comparing pumps on the two systems, lia\ang the same sized 

 steam and water cylinders, wo find that the direct acting pumps 

 have the following advantages over crank pumps: 



1st. The direct acting pump occupies less space. 



2d. The price is fully twenty per cent less. 



3d. Beincr of lono-er stroke, it does not change the direction of 

 the water so often as to develop a given capacity. 



4th. It imparts a more equal velocity to the water. 



5th. It produces less jar when in operation at high speeds mider 

 pressure. 



6th. It can deliver a greater amount of water in a given time. 



7th. It may be run as slow as desirable without fear of stop- 

 ping. 



8th. It will start at any part of the stroke, even when the steam 

 and exhaust pipes are full of condensed water, by simply opening 

 the steam valve; and will run under water in case of emergency. 



No. 969. Steam Valveless Pump. (Chappell Manufacturing Co., 

 99 Bank street, New York.) A two-inch pump, with fifty pounds 

 pressure of steam in the boiler, delivered one hundred and fifty gal- 

 lons of water per minute against a head of six feet. The quantity of 

 steam used proved that this pump is equal in economy to others of 

 the same class, all of which are considerably inferior in this resj^ect 

 to the ordinary steam pump. The Chappell pump is constructed 

 with a new feature, whereby the current of steam may be changed, 

 and the suction pipe quickly cleaned when it becomes choked. 

 This is a valuable improvement. This pump is especially useful 

 on shiplioard to clear the bilges, and may be employed as a fire 

 pump in case of an emergency. We consider it, with its improve- 

 ments, the best pump of its kmd in the market, and recommend 

 for it a first premium. 



No. 662. Gericke's Centrifugal Pump. (Turbinate Pump Co., 

 112 "Wall street, New York.) The power was measured by a 

 dynamometer, and the water by the tanks before described. A 

 five-inch pump required 736 revolutions and two and one-tenth 

 horse power to deliver 343 gallons of water per minute against a 

 head of six feet. 



This trial showed conclusively that a given quantity of water 

 may be lifted a short distance with this pump much more economi- 

 cally than with an ordinary steam pump. 



The trial under pressure, obtained by throttling the discharge, 

 did not give as good results as the steam pump. 



