612 TESTING FOR BUTTERFAT 



tenths per cent graduations, projecting 1 mm. to the left ; the whole 

 per cent graduation shall extend at least 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 maximum error in the total graduation or in any part there- 

 of shall not exceed the volume of the smallest unit of the graduation. 



Neck. The neck shall be cylindrical and of uniform internal 

 diameter throughout. The cylindrical part of the neck shall extend 

 at least 5 mm. below the lowest and above the highest graduation 

 mark. The top of the neck shall be flared to a diameter of not less 

 than 10 mm. 



Bulb. The capacity of the bulb up to the junction of the neck 

 shall be not 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 between 31 and 

 33 mm., and the maximum diameter between 35 and 37 mm. 



The charge of the bottle shall be 18 grams. 



The total height of the bottle shall be between 150 and 165 mm. 

 and 6j^ inches). 



Cream Test Bottle 1. 50 per cent 9 gram short-neck cream 

 test bottle, graduated to 0.5 per cent. 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 T / 2 inches). The gradu- 

 ation shall represent 5 per cent, 1 per cent, and 0.5 per cent. The 

 5 per cent graduations shall extend at least half-way around the 

 neck (to the right). The 0.5 per cent graduations shall be at least 

 3 mm. in length, and the 1 per cent graduations shall have a length 

 intermediate between the 5 per cent and the 0.5 per cent graduations. 

 Each 5 per cent graduation shall be numbered, the number being 

 placed on the left of the scale. 



The maximum error in the total graduation or in any part 

 thereof shall not exceed the volume of the smallest unit of the 

 graduation. 



Neck. The neck shall be cylindrical and of uniform internal 

 diameter throughout. The cylindrical part of the neck shall extend 



