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DESCRIPTION | 
OF AN 
EUDIOMETER, 
And of other Apparatus employed in Expe- 
riments on the Gases, 
BY W. HENRY, M.D. F,R.S. &c. 
(Read Nov. 11, 1811.) 
CWARS 
CHEMICAL instruments have generally, 
by their progressive improvement, been ren- 
dered more complicated and expensive ; but 
the one, which I am about to describe, if it 
has any merit, is recommended by greater 
simplicity and economy, than those which 
have hitherto been applied to the same pur- 
pose. While it possesses these advantages, 
I am not aware that it is liable to objection 
from any sources of inaccuracy, that do not 
equally exist in all other eudiometers. 
In its construction, it most nearly resem- 
bles, and indeed was originally suggested by, 
one which was invented, several years ago, by 
Professor Hope of Edinburgh. His appa- 
ratus consists of a tube sealed at one end, 
which holds precisely a cubic inch, and is 
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