After 24 hours, they
are again boiled for the same length of time and allowed to cool. After
another 24 hours, they are subjected to boiling for a third time. Then
the jars of food are removed and sealed as in the one-period cold-pack
method. By the fractional-sterilization method, the spores of bacteria
contained in the food packed in the jars are given a chance to develop
during the 24-hour periods after the first and second cookings, those
which become active being destroyed by cooking the second and third
times. Although some canners prefer this method to those already
mentioned, the majority look on it with disfavor, owing to the length of
time it requires.
STEAM-PRESSURE METHODS
43. For canning foods by steam pressure, special equipment is necessary.
In one of the steam-pressure methods, what is known as a _water-seal
outfit_ is required, and in the other a device called a _pressure
cooker_ is employed. The work of getting the containers ready, preparing
the food for canning, packing it into the jars, and sealing and testing
the jars is practically the same in the steam pressure methods as in the
cold-pack methods.
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