2/6 MODERN METHODS OF TESTING MILK 



the five-tenths per cent, graduations shall be i mm. 

 longer than the tenths per cent, graduations, project- 

 ing i mm. to the left ; the whole per cent, graduations 

 shall extend one-half way around the neck to the right 

 and projecting 2 mm. to the left of the tenths per cent, 

 graduations. Each per cent, graduation shall be 

 numbered, the number being placed on the left of the 

 scale. The error at any point of the scale shall not 

 exceed one-tenth per cent. 



(2) Neck The neck shall be cylindrical for at least 

 9 mm. below the lowest and above the highest gradua- 

 tion mark. The top of the neck shall be flared to a 

 diameter of not less than 10 mm. 



(3) Bulb The capacity of the bulb up to the junc- 

 tion of the neck shall not be less than 45 cc. The shape 

 of the bulb may be either cylindrical or conical, with 

 the smallest diameter at the bottom. If cylindrical, the 

 outside diameter shall be between 34 and 36 mm. ; if 

 conical, the outside diameter of the base shall be be- 

 tween 31 and 33 mm. and the maximum diameter be- 

 tween 35 and 37 mm. 



(4) The charge of the bottle shall be 18 grams. 



(5) The total height of the bottle shall be between 

 150 and 165 mm. (5^ and 6]/ 2 inches). 



(6) Each bottle shall bear a permanent identifica- 

 tion number. 



Standard cream-test bottles : 50 per cent., 9-gram, 

 so-called 6-inch, and 9-inch. (i) Graduation The 

 total per cent, graduation shall be 50. The graduated 

 portion of the neck shall have a length of not less than 

 63.5 mm. (2,y 2 inches). The graduation shall represent 

 5 per cent., i per cent., and five-tenths per cent. The 

 five-tenths per cent, graduations shall be at least 3 mm. 

 in length; the i per cent, graduations shall be 2 mm. 

 longer than the five-tenths per cent, graduations, pro- 

 jecting 2 mm. to the left; the 5 per cent, graduations 

 shall extend halfway around the neck to the right and 

 project 4 mm. to the left of the five-tenths per cent. 



