THE TESTING OF MILK AND CREAM 103 



(Approved by Dairy Instructors' Assoc, 1916.) 

 I. Apparatus and Chemicals 



Milk Test Bottle. 8 per cent 18-gram milk test bottle, graduated to .1 

 per cent. Graduation — The total per cent graduation shall be 8. 

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

 63.5 millimeters (2| inches). The graduation shall represent whole 

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

 cent graduations shall not be less than 3 millimeters in length; the 

 five-tenths per cent graduations shall be 1 millimeter longer than 

 the tenths per cent graduations, projecting 1 millimeter to the left ; the 

 whole per cent graduation shall extend at least one-half way around the 

 neck to the right and projecting 2 millimeters 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 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 

 at least 5 millimeters 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 millimeters. 



Bulb — The capacity of the bulb up to the junction of the neck shall 

 not be less than 45 cubic centimeters. 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 milli- 

 meters ; if conical, the outside diameter of the base shall be between 

 31 and 33 millimeters, and the maximum diameter between 35 and 37 

 millimeters. 



The charge of the bottle shall be 18 grams. 



The total height of the bottle shall be between 150 and 165 milli- 

 meters (5| and 6| inches). 



Cream Test Bottle No. 1. 50 per cent 9-gram short-neck cream test bottle, 

 graduated to .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 millimeters (2£ inches). The graduation shall 

 represent five per cent, one per cent, and five-tenths per cent. The 

 five per cent graduations shall extend at least halfway around the neck 

 (to the right). The five-tenths per cent graduations shall be at least 

 3 millimeters in length, and the one per cent graduations shall have a 

 length intermediate between the five per cent and the five-tenths per 

 cent graduations. Each five 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. 



