People's Pure Ice Company started in the 1890s and originally consisted of four buildings at 34 Clybourn Place. Today's location would be Cortland Street at Winchester Avenue.
The plant was built on one floor and was the first plant in the United States to utilize the "closed system" throughout. Nowhere within the buildings or about the plant is any escaping steam visible or is any water to be seen. All the machinery and apparatus, steam condensers, ammonia condensers, reboilers, water filters, etc., are all enclosed, and the steam passes in a continuous course, absolutely unexposed, from the boilers to the cans in the freezing tanks.
The model plant where all this was satisfactorily accomplished was known as the ice factory of the People's Pure Ice Company, Chicago, which was erected in 1901.
The "Ice and Refrigeration" Newsletter, March 1, 1904 (pdf), an 11-page article, with lots of pictures.
Compiled by Dr. Neil Gale, Ph.D.