2t 
-307 37 
Description of the Valve Siphon. 
it will continue to act as a common siphon, and the ves- 
sel will be emptied, unless supplied from some reservoir, 
as N. 
As soon as the siphon is filled, and begins to discharge 
the liquid at L ; or at any period while it continues full ; 
if 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 ex- 
tremity E is immersed 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, 
and then removed into a vessel of the same kind of liquid, 
that has a sediment at bottom, which would be disturbed 
by moving it up and down. This however may not al- 
ways be convenient : Mr. Argand therefore makes an 
aperture with a short perpendicular tube O in the hori- 
zontal branch BB, through which, by means of a funnel, 
I), the siphon may be filled, while the cock F is shut; so 
that it may be inserted into the liquid, and made to act 
without disturbing it. When the siphon is thus filled, or 
when the funnel I) is not required, the aperture at O is 
closed by the stopple Gh 
For the convenience of carrying the syphon, as well as 
for packing it up, or cleaning it, the horizontal and per- 
pendicular branches are made to take asunder at the joints 
MM. The nozzle L is likewise made to take off, as it 
is frequently more convenient for the fluid to be drawn 
off perpendicularly. 
