CHEMICAL TESTS AND ANALYSES 359 
above 60 add .0313 points to the observed reading. For every 
degree Fahrenheit below 60, deduct .0313 points from the ob- 
served reading. 
The specific gravity is determined by the use of the following 
formula: 
he 145.5 
PIECING OG aN Ly ee 
2 145.5 — 
B = Corrected Beaumé reading. 
Ixample: Beaumé reading at 80 degrees F. is 7.8. 
Corrected reading =/7.8+ |[(80—60) < .0313] = 8.43. 
ae : 145.5 E 
Specific gravity = —_~——___ = 1.0613. 
: 145.5 — 8.43 
Equally good results may be obtained by diluting the evap- 
orated milk with an equal weight of water. Then take the Que- 
venne lactometer reading at 60 degrees FF. Multiply the reading 
by 2, add 1000, and divide by 1069. 
Gravimetric Determination. 
Dilute the evaporated milk with four times its weight of 
water and proceed as directed under “ Milk.” 
Total Solids. 
By Means of Specific Gravity and Babcock Formula. 
Determine the specific gravity as above directed. Multiply 
by 1000 and substract 1000. Then use the following formula: 
L 
LD Set 
4 ar 
IL, = The figure derived from the specifte gravity by above 
calculations. 
f=" per cent tak 
Example: Evaporated milk tests 7.8 per cent fat and has a 
specific gravity of 1.0615. : 
L = (1.0615 *« 1000) — 1000 = 41:3. 
: O15 ra 5 
Total solids = et 1.2 & 7.8 -= 24.74 per cent. 
For rapid determination of the total solids of evaporated 
milk the factory operator is referred to the following tables from 
which the per cent total solids may be read at a glance when the 
Beaumé reading at 60 degrees F. and the per cent fat are known. 
