ICE-CREAM FACTORIES 



179 



for about twenty-four hours until the cream is thoroughly 

 hardened all through and until taken out for shipment. 



To prepare the cream for shipping, the cans are placed 

 in a tub and packed with salt and ice. 



Artificial refrigeration is employed for all the cooling, 



FIG. 45. Ice-cream hardening room in Wheat's factory. 



using the direct expansion in the storage and hardening 

 rooms, and brine for the cooling coils and freezers. The 

 factory makes all its own artificial ice used in the packing 

 cans for shipment. 

 In one style of hardening room, the cans are placed 



