88 TjiAXSACTIOXS OF THE A.MEIilCAN INSTITUTE. 



in<2: tliis pump, l)ut its great capacity fur elevating and discharging 

 large volumes of water in cases of emergency, where the consumption 

 of steam is a matter of secondary imj^ortance, warrants us in recom- 

 mending for it a first premiiun. 



Witli regard to the central discharge centrifugal pump, exhibited 

 by the same firm, under the same number (532), m'c consider that the 

 points of resemblance between this more modern pump and the 

 Gericke pump are too numerous to permit our directing special 

 attention thereto. 



No. 134. Turbinate Force Pump. — J. II. A. Gericke, Jersey City, 

 K J. 



The construction of this pump is quite similar to that of the Jonval 

 turbine. The parts are well designed, and not liable to derange- 

 ment from the entrance of foreign substances.-* We consider it a very 

 efficient pump, and recommend the award of a first premium, as 

 the best turbinate force pump oftered to the public. 



No. 4Y4. Mlnhuj and WrecJcmg Pump. — Continental Iron Works, 

 Greenpoint, L. I. 



The extreme simplicity of parts displayed in the construction of 

 this pump, and the facility with which the scroll wheel can be with- 

 drawn without disturbing the surrounding case or the driving belt, 

 are features that must reconnnend it to all engaged in mining and 

 wrecking pursuits. We regret that lack of time preve'nted our hav- 

 ing an experimental test of both this and the Gericke pump. We 

 however recommend for this a first premium as an exceedingly sini- 

 ple and desirable form of rotary pump. 



No. 589. Steam Pumjnng Engine. — P. S. Justice, Philadelphia, 

 Pennsylvania. 



This device is of the construction technically known as a " dia- 

 phragm pump." Tlie arrangement and method of operating the 

 steam valves appear to us to be novel and ingenious ; but the steam 

 is separated from the water by a diaphragm only, and must therefore 

 be subject to considerable condensation, and therefore there is a lack 

 of economy. One of the greatest difficulties in the construction of 

 this class of pumps is to obtain a reliable and duraV)le diaphragm, 

 and as to this feature in the present pump we are not advised. In 

 cases where it is desirable to have a pump possessing no rubbing sur- 

 faces, for instance, one for pumping dirty or gritty water, this one we 

 /Cloubt not would be found desirable and efficient. We recommend 

 for these exhibitors a second premium for a steam pumping engiue. 



