Cojllervdar. 
Phil.Trans.18Ql. A. Plate 12. 
DIAGRAM OF SULPHURIC ACID GAUGE. 
FlO[ 8 
c 
B 
> 
Scale j/io 
SecLwru cut CorD 
Porcelcurv Air Tkemometer 
PilH size 
West.NewmaTx Co .lith 
