How to restore a National No7 Pressure Canner

Had this canner given to us. It was in rough shape so we restored and tested it.

National Presto Industries, Inc. was founded in 1905 in Eau Claire, Wisconsin under the name "Northwestern Steel and Iron Works", making pressure canners (called "canner retorts" back then) for commercial canneries. These were 50-gallon and later 30-gallon pressure canners. The company installed an aluminum foundry in 1915 for the specific purpose of manufacturing large-size (1900 gallon) pressure canners for home use.

They produced the No. 7 cooker/canner starting in 1917. In 1925 the company name changed to National Pressure Cooker Company. And then the company changed names again and became Presto in 1939. The "Presto" Pressure Cooker was introduced at the 1939 New York World's Fair. I

So if the canner says "Old National" on it, you know it is older than 1940.


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