104 MANUAL OF MILK PRODUCTS 



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 graduation 

 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 9 grams. All bottles shall bear on 

 top of the neck above the graduations, in plainly legible characters, a 

 mark defining the weight of the charge to be used (9 grams). 



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

 meters (5| and 6^ inches), same as standard milk test bottles. 



Cream Test Bottle No. 2. 50 per cent 9-gram ^long-neck cream test 

 bottle, graduated to .5 per cent. The same -specifications in every detail 

 as specified for the 50 per cent 9-gram short-neck bottle shall apply for 

 the long-neck bottle with the exception, however, that the total height 

 of this bottle shall be between 210 and 235 millimeters (8| and 9 

 inches), that the total length of the graduation shall be not less than 

 120 millimeters, and that the maximum error in the total graduation 

 or in any part thereof shall not exceed 50 per cent of the volume of the 

 smallest unit of the graduation. 



Cream Test Bottle No. 3. 50 per cent 18-gram long-neck cream test 

 bottle, graduated to .5 per cent. The same specifications in every detail 

 as specified for the 50 per cent 9-gram long-neck bottle shall also apply 

 for the 18-gram long-neck bottle, except that the charge of the bottle 

 shall be 18 grams. All bottles shall bear on top of the neck above the 

 graduation, in plainly legible characters, a mark defining the weight 

 of the charge to be used (18 grams) . 



Pipette, capacity, 17.6 c.c. Total length of pipette not more than 

 330 millimeters (13J inches). Outside diameter of suction tube 6 to 

 8 millimeters. Length of suction tube 130 millimeters. Outside 

 diameter of delivery tube 4.5 to 5.5 millimeters. Length of delivery 

 tube 100 to 120 millimeters. Distance of graduation mark above bulb 

 15 to 45 millimeters. Nozzle straight. To deliver its contents when 

 filled to the mark with water at 20 degrees Centigrade, in five (5) to 

 eight (8) seconds. The maximum error shall not exceed five one- 

 hundredths (.05) cubic centimeter. 



Acid Measure, capacity 17.5 c.c. 



Cream Testing Scales, sensibility reciprocal of thirty milligrams, 

 i.e. the addition of thirty- milligrams to the scales, when loaded to 



