APPENDIX 



STANDARDS FOR GLASSWARE USED IN 

 BABCOCK TEST 



So great variations were found in the forms and ac- 

 curacy of the glassware used in the Babcock test that 

 it became necessary for official bodies to make investi- 

 gations and adopt certain recognized standards. The 

 Dairy Instructors' Association, in 1911, adopted 'de- 

 tailed specifications in regard to the construction and 

 graduation, etc., of such glassware, while the Associa- 

 tion of Official Agricultural Chemists, in 1908, adopted 

 standards of accuracy and rules for testing, as given 

 below : 



SPECIFICATIONS FOR CONSTRUCTION AND 



GRADUATION OF STANDARD BABCOCK 



GLASSWARE 



The following are standard Babcock test-bottles for 

 milk and cream : 



(1) Milk-test bottles, 8 per cent., i8-gram, 6-inch. 



(2) Cream-test bottles, 50 per cent., g-gram, 6-inch. 



(3) Cream-test bottles, 50 per cent., 9-gram, 9-inch. 



Standard milk-test bottles: 8 per cent., 18-gram, 

 6-inch. (i) Graduation The total per cent, gradua- 

 tion shall be 8. The graduated portion of the neck shall 

 have a length of not less than 63.5 mm. (2 l / 2 inches). 

 The graduation shall represent whole per cent, five- 

 tenths per cent, and tenths per cent. The tenths per 

 cent, graduations shall be no less than 3 mm. in length ; 



275 



