JVfW and veryfunpU Steam Engine. 545 



Two days after this experiment was made, the furfaces of the acid and fulphate were 

 ftill as diftinfl: as ever ; but the ftratum of fulphate was nearly double its original thick- 

 nefs, owing evidently to its having combined with a confiderable portion of the acid. 

 This experiment, I think, proves that fulphuric acid is alfo a conduftor of caloric. 

 Indeed, it is more than probable that all fluids are conductors. 



II. 



Defcription of a Sifatn Engine on the Principle of Savary, operating hy afeparate Condenfer ; 

 muith other ejfcntial Improvements . By Mr. JoHS NaUCAR&OW*. 



X LATE XXIII. Fig. 3. A. The receiver, which may be made either of wood or iron. 

 liBBB. Wooden or caft-iron pipes for conveying the *srater to the receiver, and from 

 thence to the penftock. 



C. The penftock or ciftern. 



D. The water-wheel. 



E. The boiler, which may be either iron or copper. 



F. The hot-well for fupplying the boiler with water. 



GG. Two cifterns under the level of the water, in which the fmall bores BB, and the 



condenfer are contained. 

 HHH. The furface of the water with which the fteam-engine and water-wheel arc 



fupplied. 

 aa. The fteam-pipe, through which the fteam is conveyed from the boiler to the 



receiver. 

 h. The feeding-pipe, for fupplying the boiler with hot water. 

 ccccc. The condenfing apparatus. 



dd. The pipe which conveys the hot water from the condenfer to ths hot-well. 

 tee. Valves for admitting and excluding the water. 

 ff. The inje£tion pipe, and g the injeftion cock. 

 h. The condenfer. 



It does not appear neceflary to fay any thing here on the manner in which this machine 

 performs its operations without manual afljftance, as the method of opening the cocks by 

 which the fteam is admitted into the receiver and condenfed, has been already well de- 

 fcribed by feveral writers. But it will be neceflary to remark that the receiver, penftock, 

 and all the pipes, muft be previoufly filled f before any water can be delivered on the 



• From « learned paper on Mills, in the American Tranfaftions, IV, page 355. I have not been able 

 to extraft the theoretical parts of the paper, bscaufe the plates and references are too imperfeft. 



t Or the air blown out by fteam; which may perhaps be lefs convenient thin the method in the 

 text,~N. 



Vol. IV.— March i8or. ^ 4A wheel; 



