CONSTRUCTION OF AN HYDRAULIC APPARATUS. %t 



V. 



Conjlruclion of an Hydraulic Apparatus, which by Means Of the 

 Syphon raifs Water above its letel, and performs its Alterna- 

 tions iiithout Attendance. By Mr. Wm. Close. 



To Mr. NICHOLSON, 

 SIR, 



Dalton, Nov. 6, 1801. 



l\T the time when I wrote to you on the application of the New method of 



fyphon to raife water above the refervoir, I could find no eafy r j* ifi "S ™ atcr h J 



method of making the inftrument afford an equable fupply 



without attendance. Since then, however, I have thought of 



a combination for the purpofe, applicable to any height under 



an elevation of thirty feet ; and another to raife water below 



the refervoir, independant of the prefiure of the atmofphere. 



I fend you a drawing, and defcription of each. 



Plate III. exhibits a reprefentation of the apparatus for Drawing and de- 

 railing water above the refervoir. An air pipe is inferted into fcn P tion ot a P- 



* * paratus» 



one fide of the turn of the fyphon S S, and a fmall plate is 



fixed on the fide of its aperture oppofitc the fhorter branch to 

 obftruct part of the current. At fome diftance from the fy- 

 phon this pipe divides into two branches, 2, 3, which lead to 

 two veffels A and B. At the feparation is fixed a cock of 

 fuch a conftruction, that the air pipe 1 can only communicate / 

 with one of its branches at once. The barrel of the cock, or 

 that part which is reprefented by fliort radial lines in the fec- 

 tion of this part of the apparatus, has three lateral openings : 

 the plug or key which moves within the barrel contains a duct 

 or channel, which, inflead of palling ftraight through it, is 

 turned with fuch a bend, that when one end of it is under the 

 opening of the air pipe, the other will be oppofite the orifice 

 of one of the pipes 2, 3. The communication from the air 

 pipe to either of its branches is therefore completed by about a 

 quarter of a turn. 



N The vefTels A and B have each a pipe with a valve at its 

 lower end, connected with the ciftern C C, to carry up water, 

 and two other pipes, one to let out the raifed water, and the 

 other to take in air at the fame time. The air pipe need only 



be 



