73 Dr. Hare's Inproved Eudiometers. 
Or THE Merourrat oe, Roo Evpiometer, with A 
TER GavGeE. 
The Eudiometer which | have described, though satisfac- 
tory in its results, and in its conveniency, when used wit 
water, has not been found’so when used over mere: ry. The 
great weight of this fluid caused-the ind:catio ts to vary in con- 
sequence of variations of position, during manipulation, too 
slight to be avoided. The instrument represented in the fol- 
lowi.g cut, (fig. 4.) is furnished with a water gauge, which 
being appealed to, enables us to render the density of the 
gases within, in equilibrio with the air wivhout. Hence we 
can effect their measurement with great accuracy. 
Fig. 4 
4 *, 
er lin yer et ae 
