328 BUTTER MAKING. 



For creameries the brine system is the only practical sys- 

 tem. It is preferred because, first, cold can be stored in an 

 insulated brine-tank and used at will without running the com- 

 pressor. In case of a prolonged stoppage due to some accident 

 a brine made by a mixture of ice-water and salt could be 

 temporarily substituted; second, less ammonia is required to 

 charge the system; third, fewer couplings and less ammonia 

 pipes are necessary. This latter would decrease the danger 

 of ammonia leakage and cost of pipes. 



