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Canning in the early 1940's is not so different from home canning today.
Glass canning jars are used along with a two piece lid. One part of the lid fits the mouth of the jar and is designed to seal under high heat. The second part to the lid is a ring that screws onto the jar to hold the seal in place until it has sealed.
Jars and lids are sterilized before use. In the 1940's they would have been put into a pot of boiling water for several minutes. You can do the same now or use the dishwasher.
The food is prepared to be canned. Most vegetables are cleaned and blanched, which means immersing them briefly in boiling water, then an ice bath. Fruits, meat and fish can go in as is.
The jars are packed tightly so as not to waste space and then water is added to fill the jar. You can also add sugar to fruit.
The lids are put on and the jars are immersed in a pot of boiling water. The length of time they remain is dependent on what you are canning. You can also use a pressure cooker for this step.
Once the jars are done, they are removed with tongs and placed on a kitchen towel to rest undisturbed. Within the next several hours, you should hear the cans pop, which means they have sealed.
Any jars that have not sealed within several hours can be re-done using a new seal or put into the refrigerator to be consumed within the next few days.
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