^0 
Description of the Valve Siphon. 
enable them to make discoveries interesting to the arts and 
the sciences. 
The names of the eight Frenchmen, in the order in 
which they descended, are as follow : Debeer, secretary 
to the ambassador Alquier; Houdouart, chief engineer of 
bridges and causeways attached to the army of Italy; 
Wickar, painter; Dampierre, adjutant- commandant ; Bag- 
neris, physician to the army of observation; Fressinet 
and Andras, French travellers; and Moulin, inspector of 
posts. 
NO. 3. 
Description of the Valve Siphon of the late Mr. Ami Ar= 
ganb, Inventor of the Lamps with a Double Current 
of Air.* 
(With an engraving.) 
THIS improvement, though simple, is ingenious, and 
particularly adapted to large siphons, that require to be 
removed from one vessel to another. A valve, as E, or 
H, pi. I. fig. 3, is applied to the foot of the shorter or as- 
cending leg of a siphon AH, BC, at the other foot of which 
a stop cock F is placed The cock being open, and the 
foot E immersed in any liquid in a vessel IK, by moving 
the leg E perpendicularly downward and upward, the li- 
quid will gradually ascend through the valve E, till it 
runs out at the 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 
* Nicholson, vol. xviii. p. 61. From Sonnini’s Bibiiotheque Physico-econo- 
ihique, Nov. 1806, p. 11 7. 
