Any bottle, pipette, or other measuring glass or utensil that has been 

 tested and verified as aforesaid shall be marked by the director or 

 by his said deputy or deputies to indicate the fact, or if tested and 

 found to be inaccurate may be marked by him or them to indicate 

 that it is inaccurate. No bottle, pipette, or other measuring glass or 

 utensil that has been marked by the said director, or by his duly 

 designated deputy or deputies, to indicate that it is inaccurate shall 

 be used in this commonwealth by any person in determining the 

 composition or value of milk or cream. 



Section 2. Every Babcock or other centrifu- 



Babcock machines gal machine used in this commonwealth by any 



subject to inspector of milk or cream, or by any person in 



yearly inspection, any milk inspection laboratory for determining 



the composition of milk or cream for purposes 



of inspection, or by any person in any milk depot, creamery, cheese 



factory, condensed milk factory or other place for determining the 



composition or value of milk or cream as a basis for payment in 



buying or selling, shall be subject to inspection at least once in each 



year by the director of the Massachusetts agricultural experiment 



station or by an inspector or deputy of the said director. The owner 



or user of any such centrifugal machine shall pay to the said director 



for the use of said station as a fee for making such annual inspection 



the actual cost of such inspection for each machine inspected. 



Any Babcock or other centrifugal machine used as aforesaid that 

 is not, in the opinion of the director, or of an inspector or deputy of 

 the said director, in condition to give accurate results, may be con- 

 demned by the director or by his inspector or deputy. No Babcock 

 or other centrifugal machine that has been condemned by said direc- 

 tor or by an inspector or deputy of the director as not in condition 

 to give accurate results shall be used in this commonwealth by any 

 person for determining the composition or value of milk or cream as 

 aforesaid, unless the machine be changed to the satisfaction of the 

 said director or of his inspector or deputy, and approved by him. 



Section 3. No inspector of milk or cream, 

 Operators must and no person in any milk inspection labora- 

 secure certificate of to ry, shall manipulate the Babcock or other 

 competency* centrifugal machine for the purpose of deter- 

 mining the composition of milk or cream for 

 purposes of inspection, and no person in any milk depot, creamery, 



