74 [Assembly 



Report on Pirssoir's DouIjIc Vacuum Steam Condenser. 



The judges, to whom the subject of Pirsson's Double Vacuum 

 Steam Condenser has been referred, respectfully report : 



That this invention is well known to them all, in its general 

 form and principle j that some of them have had opportunities 

 for seeing it in actual use; and that abundant evidence has been 

 exhibited to them of its complete success in practice. The prin- 

 ciples on which this "Steam Condenser" is planned, consist, 1. 

 In the condensation ot the steam which has been employed in 

 working an engine, and the collection of the water formed by its 

 condensation, separate and apart from the water, by whose re- 

 frigerating effect the steam is condensed. And, 2: In performing 

 this condensation in such a manner, that no cessation of the work- 

 ing of the engine shall take place, even should the part of the 

 apparatus in which the steam is condensed, after leaving the en- 

 gine, fail altogether, or should its action be partially deranged. 



The first of these objects, is of great and universally admitted 

 importance, whenever water holding saline matter in solution, and 

 particularly when sea-water is the only description of that fluid 

 which can be readily obtained. Various plans have been proposed 

 for attaining this object, but so far as the undersigned know, none 

 of them have come into general use, in consequence of their not 

 having fulfilled the second of the above named purposes. Pirs- 

 son's Condenser, not only accomplishes all that has ever been an- 

 ticipated by any of these plans, but accomplishes the second ob- 

 ject so completely and effectually, that the utmost injury that it 

 can experience, will do no more than reduce the engine to the state 

 of one working in the ordinary manner, in which the water ari- 

 sing from the condensed steam is mixed, with that which has been 

 employed in condensing it. 



These two objects are accomplished ; 1. Ey the use of a con- 

 denser, having the general form, character, and construction of 

 that usually employed in steamers, which condenser is kept free 

 by an air pump, in the usual manner, and 



