APPENDIX 277 



graduations. Each 5 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 five-tenths per cent. 



(2) Neck (Same as standard milk test-bottle). 

 The neck shall be cylindrical for at least 9 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. 



(3) Bulb (Same as standard milk test-bottle). 

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

 shall not be less than 45 cc. The shape of the bulb may 

 be either cylindrical or conical, with the smallest diam- 

 eter at the bottom. If cylindrical, the outside diameter 

 shall be between 34 and 36 mm. ; if conical, the out- 

 side diameter of the base shall be between 31 and 33 

 mm. and the maximum diameter between 35 and 37 

 mm. 



(4) The charge of the bottle shall be 9 grams. 



(5) The total height of the 6-inch bottle shall be 

 between 150 and 165 mm. (5% and 6y 2 inches), (same 

 as standard milk-test bottles) ; of 9-inch bottles, be- 

 tween 210 and 225 mm. (8*4 and 8% inches). 



(6) 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 gram). 



Each bottle shall bear a permanent identification 

 number. 



Standard Pipette. Total length of pipette not more 

 than 330 mm. (13*4 in.). 



Outside diameter of suction tube, 6 to 8 mm. 



Length of suction tube, 130 mm. 



Outside diameter of delivery tube, 4.5 to 5.5 mm. 



Length of delivery tube, 100 to 120 mm. 



Distance graduation mark above bulb, 50 to 60 mm. 



Nozzle, straight. 



Delivery, 17.6 cc. of water at 20 degrees C. in 5 to 8 

 seconds. 



