126 



CLEAN MILK 



fined under pressure. In Fig. 29 is shown a high pressure steri- 

 lizer. It must be built very strongly to withstand the pressure, 

 which is over fifteen tons against the door alone, with a pressure of 

 ten pounds of steam in the sterilizer. The matter of a sterilizer in 



Fig. 29. 



Star High Pressure Sterilizer. 



which the steam is not confined under pressure is a comparatively 

 simple affair. One may be home-made. The writer had a sterilizer 

 built of two-inch plank, lined with galvanized iron, with double 

 doors fastened with an iron bar across the front. The shape was 



