1908.] PUBLIC DOCUMENT — No. 33. 115 



Original Standard. 

 Dr. Babcock, 1 originator of the method, laid down the fol- 

 lowing requirements relative to the graduation of bottles : — 



The 10 per cent, of fat represented upon the necks of the bottles corre- 

 spond to a volume of 2 cubic centimeters. 



In addition, this is stated to be equivalent by weight to 2 

 grams of water or 27.18 grams of mercury (specific gravity 

 13.59). No mention of temperature being made, presumably 

 60° F. was intended. This would indicate the Mohr cubic cen- 

 timeter, and is supported by a statement of the Emil Greiner 

 Company, under date of Dec. 3, 1906 : — 



When we made the first bottles for Dr. Babcock, nearly twenty years 

 ago, we were simply told to graduate the space of 2 cubic centimeters into 

 50 parts, and each five parts representing 1 per cent, butter fat. There- 

 fore, 1 percent, is .2 of a cubic centimeter, and at that time the Mohr cubic 

 centimeter was considered the standard. 



Concerning the graduation of pipettes, Dr. Babcock stated : — 



It should contain, when filled to the mark, 17.6 cubic centimeters . . . 

 (and) . . . will deliver a little less than 17.5 cubic centimeters of milk. 



Capacity in Mohr cubic centimeters was evidently the intent 

 of the graduation. 



Manufacturers' Basis of Graduation. 

 The eastern trade in Babcock glassware is largely supplied 

 by three manufacturers, the Emil Greiner Company of New 

 York, Kimball Glass Company of Chicago and Wagner Glass 

 Works of New York. Upon request, the above firms furnished 

 the following data relative to their standards of graduation. 

 The Emil Greiner Company employed the Mohr cubic centi- 

 meter (1 gram of water at 15° C), and calibrated with either 

 water or mercury (specific gravity 13.6 at ordinary room 

 temperature). The Kimball Glass Company used the true 

 cubic centimeter, and calibrated with mercury (specific gravity 



i Wisconsin Agricultural Experiment Station, seventh (1890), ninth (1892) and tenth 

 (1893) annual reports. 



