36 Milk and Its Products. 
responding to the assumed least specific gravity of 
milk, or 1.029. ) (-) a 
Tf, then, in any 1.000 0 
given sample of 
milk the lactom- 
eter fell to 90, 60% 
it would indicate 
the presence of 10 
per cent of water ; 1.0104 
if it fell to 75, of 
25 per cent of 
water, ete. This 1,015 
form of lactometer 
is now known as 
the common, or- 1920 
dinary or Board 
of Health lactom- 
eter. A second 
form of lactometer 
in common uses 
was devised by 
Quevenne, and 
bears his name. 
The scale of this 
hydrometer is or- 
dinarily graduated 404 
from 15 to 40, the 
29 being coinci- a 
dent with 100 up- A ¢ 
: A B Cc 
on the ordinary lac- Fig. 2. Comparison of graduation on lactometer 
. i stems: A, hydrometer ; B, ordinary lactometer; 
tometer and with C, Quevenne lactometer. 
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