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Boiler

2. The Water-Seal Canner. This is much more desirable than the above, as the period of sterilization is shorter and less fuel is required; and less water is needed, making lifting lighter. The water-seal canner consists of two containers, one fitting within the other, and a cover which extends into the space between the outer and inner container.

The water-jacket thus formed makes it possible for the temperature within the container to be raised above 212° F., and since steam is hotter than boiling water, quickly accomplished. Such outfits are