COLORADO EXPERIMENT STATION 
25 
tie on the large scales causes an error for the next sample weighed in 
the same set of weighings. 
8. Dividers should be sharp-pointed and move with plenty of 
friction at the hinge. Dividers which are loose and likely to slip should 
be mended at once. 
9. A pipette may be used to transfer a cream charge to the test 
bottle or for adding hot water to the test, but it must not be used to 
measure the cream test. 
A wide mouthed pipette is better for cream, as it will not clog so 
easily as a narrow mouth. 
10. An acid measure is a small glass cylinder marked at 8.8 c. c. 
capacity for 9 gram tests and 17.5 c.c. for 18 gram tests, used in meas¬ 
uring the proper amount of acid to be added to the cream charge. 
11. Sulphuric acid of a specific gravity of 1.82 to 1.83 should be 
used, and care must be exercised to keep it tightly corked, as it absorbs 
moisture from the air and may thus become too weak for use. 
Wash sink Waste jar 
12. A water bath is necessary, especially so in case of hand 
testers, to maintain or bring the temperature of the tests between 120 
and 130 degrees F. until read. 
13. Test bottle brushes are necessary for cleaning bottles in which 
the dirt sticks badly. 
14. Brushes for milk cans should be on hand so that all cans used 
and returned may be kept in a clean, sanitary condition. 
15. Sample jars should have air-tight covers to prevent evapora¬ 
tion. As a matter of convenience they must be wide-mouthed and have 
a capacity for at least two tests. A half more jars are needed than the 
greatest number of patrons likely to deliver cream any one day. 
16. Cream test bottles are graduated to read the percent of fat 
according to their size ; that is, 18 gram or 9 gram. 
