[ik } 
Eudiometer, is a new word; it 
fignifies an inftrument by which we 
may judge of the degree ot falu- 
brity of the common air. The in- 
vention of fuch. an inftrument be- 
longs to Dr. Prieftley... It confifts 
chiefly of a glafs tube, divided in 
~ pats; aes inftance, in two 
|: kaF 2 e divisions 5 ; each. of which is 
livided into. ten.others, and each of 
thefe ten fub-divided again into ten 
parts: and a.glafs meafure, contain- 
ing’exactly one of the great. divifions 
of the tube.. -One meafure of com= 
one air noe one af nitrous Bus put 
nution of the bulk.of the two airs is 
compleated, and afterwards let up 
in the glafs tube, indicates at once 
the exact diminution of the two ~ 
joint | meafures. The degree of 
as 6 goodnefs 
a “left ree ia pi till cae ey 3 
s see Meo is % 
De SSeS Rare tay os Sie nae a! ee re ree eet ee res 
