TAliVE SIPHON. 6i 



viih 



Vcsctiption of the Valve Siphon of the tate Mr. kiki Argaki^j 

 liweutorcf the Lamps with a Double Current of Air*. 



JL IILS improvement, though simple, is ingenious, and Description of 

 particularlr adapted to large siphons, that require to be re- * valve siphon* 

 moved IVom one vessel to another. A valve, as E, or H, 

 pi. II, fig. 1, is applied to the loot of the shorter or ascending 

 leg of a siphon A B, B C, at the other foot of which a step 

 cock F is placed. The cock being open, and the foot E 

 immersed in any liquid in a vessel I K, by moving the leg 

 E perpendicularly downvvard and upward, the liquid will 

 gradually ascend through the valve E, till it iTins out at th<r 

 point L. The pressure of the air on the surface I will then 

 be sufficient, to force the liquid through the valve E, as 

 long as this remains beneath it; and thus it will continue to 

 act as a common siphon, and the vessel will be emptied, 

 unless supplied from some reservoir, as N. 



As soon as the siphon is filled, and begins to discharge Conveniently 

 tiie liquid at L i or at any period while it continues full ; if removable. 

 the cock F be turned so as to stop it, it may be very safely 

 and conveniently removed to any other vessel ; as the cock 

 will prevent the liquid from running out at one end, and the ^ 



valve at the other : and the moment the extremity E is im- 

 mersed in the liquid in another vessel, and the stop cock F 

 turned, it will act again as before. 



The siphon may be filled in this way in a clear liquid, Mode of filling 



and then removed into a vessel of the same kind of liquid, ^'^1^.°°^ 'J''^' 



^ ' turbing the se- 



that has a sediment at bottom, which would be disturbed by dinientof U- 

 moving itup and down. This however may not always be ^"^'^^^ 

 convenient: Mr. Argand therefore makes an aperture with 

 a short perpendicular tube O in the horizontal branch B B, 

 through which, by means of a funnel, D, the siphon may be 

 filled, while the cock F is shut; so tliat it may be inserted 

 into the liquid, and made to act without disturbing it. When 



* Sonniui'-j Blbrioihoque PJiysico-^'conomique, Nov. 18C6, p. 117. 



th« 



