( 132 ) 
pended to the cover by means of fiddle-strings strained round them, 
B, also rests, by means of a ring Zj on a very thin supporting-bcard 
Ls, which is itself suspended by means of fiddle-strings LZ, and L,. The 
gas escapes from the boiling-glass through the holes in the supporting 
ring ZL, and the supporting board Z, into the boiling-case and 
leaves the apparatus through the exit tube 7, which leads through 
the cover of the boiling-case and the caoutchouc cap stretched over 
it. In this way the cold vapours are forced to follow the route 
indicated by the arrows and so to prevent the passage of heat to 
the bath. 
The whole boiling-glass with the supportingboard L, is suspended to 
the cover of the boiling-case as appears from the description given above. 
This cover has the shape of a cap with three holes in the upper 
sheet of thin copper, strengthened by ribs !). Through one of these 
holes leads the above mentioned exit tube 7. The two remaining holes 
serve to admit parts of the boiling-glass. The left hand one beneath 
Q is for the wooden cock-box, consisting of two pieces screwed on 
to each other and to which the left hand part of the boiling-glass 
is suspended; while the right hand hole beneath P is for the tube 
admitting the measuring-apparatus. The latter is also connected to 
the cover by means of a wooden ring, consisting of two pieces 4 
and J,, which are screwed on to the cover from both sides. The 
closure of the holes in the cover is obtained by means of a caout- 
chouc cap, having on its upper surface three tubes, which fit on 
the tubes emerging from the case and are pressed on to these by 
means of brass bands (C. f. Q), Qs). 
From the more detailed description of the mode of connecting it 
will appear, that the cock-box and the experimenting tube together with 
the cover are permanently united into a frame, to which the rest of the 
boiling-glass is suspended. In order to build up the apparatus, we 
first connect to this frame the double cover 2, 3 of the receiving 
beaker by means of the above described glass-tubes /, and G,. Then 
we should generally adjust in its place the apparatus to be immersed 
in the liquefied gas. So in Dr. HASENOEHRL's case the glass-tube g, 
carrying the cover m of the condenser, was introduced into the 
experimenting tube and fastened by means of the caoutchouc-tube 
g, and the brass band 43 *). The thin wire gy, which is to put the 
1) See section through upper surface of cap next to it. 
*) g is pushed through the cover from beneath, the side-tube u, is then connected to 
g as follows: the brass Z-piece ~,, w, (comp. Pl. I, Comm. N°, 52) is slid from above 
over g, and fastened by means of the caoutchouc-tubes w, and w, and brass bands so 
that vw, comes opposite to a hole made in g, 
Soe ee oa 
