diameter of from 32; to 34; of an bali Its legs 
9 inches long. ‘The open extremity is slightly 
BETWEEN MURIATIC ACID AND CHLORINE. 339 
now recommend it to the chemical world, as possessing every 
requisite advantage of convenience, enamine safety and pre- 
cision. 
It is represented on the margin. 
It consists of a gine ephon, having an interior 
’ 
are of nearly eat ieeeth, each being from 6 to 
funnel-shaped ; the other is hermetically sealed ; 
and has inserted near it, by the blow-pipe, two 
platina wires. The outer.end of the one wire is 
incurvated across, so as nearly to touch the edge: 
of the aperture ; that of the other is formed into. 
a little hook, to allow a small spherical button. 
to be attached to it, when the electrical spark is to be transmit- 
ted *. The two legs of the syphon are from } to-} inch asun- 
der. 
The sealed leg is graduated, by can ai successively. 
equal weights of mercury from a measure glass-tube. Seven 
ounces Troy and.66 grains, occupy the space of a cubic inch ; 
and 34+ grains represent. +4; part.of that volume. The other 
Jeg may be graduated also, though. this.is not necessary. The 
instrument is then finished. 
To use it, we first fill the whole he with mercury or 
water, which a little practice will render easy.. We then intro- 
duce into the open leg, plunged into a pneumatic trough, any 
convenient quantity of the gases, from a glass-measure tube 
containing them previously mixed in determinate proportions. 
Applying a finger to the orifice, we next remove it from the 
trough in which it stands, like a simple tube; and by a little 
dexterity, 
* In the figure, the ball should have been represented pendent from a hook. 
