Chemistry and Physics. 139 
DESCRIPTIONS OF THE DRAWINGS. 
4. A tu meters | 14 millimeters external diameter, and 4 millim 
Wioenat P Bence in hic the o vane 5 condenses. It is furnished we é a 
w-tap, 7, from which the liquid oxygen jets out. Ap’ gauge, M, 
measures the pressure up to 800 atmospheres. 
B.A fade: 4 + meters long, .; which is solid carbonic acid. The stock of carbonic 
acid i ined in a gaso cymes G, of 1 cubic cir gh capaci es three-way 
tap, , nate it when desired in munication with the appara : 
ri shell : f chlorate of potash mixed with 
ng age potassium. It is heated with gas. : crn ee 
the tube B or the gasometer G, according to the position of the, 
8. A tube, 60 anillinaeters diameter and 1°] meter long, in which is condensed the 
the pumps. This liquefied gas returns by 
gr sue 125 ie Pence " diameter and 1-1 meters long, containing liquid 
acid. 
oa P,. Doubleaction exhaustion and force pumps, exhausting sulphurous acid 
the tube rR. 
Q. A tubular condenser of sulph compressed by the pumps. This body, 
ar na returns by the smal Es the tube R. The cold water for 
acid passes through the apertures E E. 
ic acid caused by the suction of the pumps. 
