APPARATUS FOR RAISING WATER. \J 



to the lowed part of the fyphon, and collected in a veflel, is 

 employed as the medium for conveying preflure to raife water 

 in another part of the apparatus. 



In May 1803, I determined to find by experiment, under being an invert- 

 what degree of preflure it would be moft advantageous to colled ^hSfcar'nes 

 the condenfed air, and likewife the proportion then exifting down air and 

 between the two fluids moving in the fyphon. The appa- condenfes lt > 

 ratus conftru&ed for this purpofe, is reprefented in Plate L 

 Fig. 1. It required only a fmall fupply of water, but con- 

 denfed the air fufficiently to be employed in the actual con- 

 ftruction of a machine upon the principle. 



A round vertical pipe AB, half an inch in diameter, and 

 22 feet 5 inches in length, had its higher end placed in the 

 ciftern A, and its lower connected to a fmall oblong veflel 

 C, which had an inverted glafs bottle cemented upo: 4 pro- 

 jecting cylinder on its upper tide. From the other end of the 

 veflel afcended another vertical pipe D E, half an inch in 

 diameter, and 18 feet 3 inches in length, and terminated in a 

 crook, 4 feet 2 inches below the highefl part of the pipe 

 A B. 



The whole apparatus being filled with water, the ciftern and this air Is 

 having a conftant fupply fufficient to keep the furface of the f or e ^flne 

 fluid juft above the orifice of the pipe A B, when the orifice water, 

 of emiflion at E was opened, the water flowing through A B, 

 carried bubbles of air into the veflel C, which afcending, dif- 

 placed the water in the bottle, and afterwards that contained 

 in the veflel C, above the lower ends of the pipes A B and 

 D E. At the firft efflux, and after the defcent of every ma- 

 terial portion of air, the jet at E was projected feveral inches 

 from the adjutage, but its curve decreafed during the defcent 

 of more air; for the bubbles did not rife inceflantly into the 

 bottle, but after fhort intervals of reft, diflodging two or three 

 ounces of water each time, with a guggling noife, which was 

 very audible to the perfon regulating the fupply of the ciftern. 

 After the water in the veflel C was deprefled to a level with 

 the ends of the pipes, the denfe air carried down A B, afcended 

 through D E, and caufed frequent interruptions in the jet; 

 for, expanding under a light preflure, it expelled the water 

 in the higheft part of the pipe with violence, and then the 

 efflux ceafed for fome time after. 



Vol. XII.— September, 1805. C '" " The 



