Still using a 1930s pressure canner (from National Pressure Cooker Co.) that's been used by my family for 5 generationsBillypisschips t1_j1jfo0b wrote
Reply to comment by cleeder in Still using a 1930s pressure canner (from National Pressure Cooker Co.) that's been used by my family for 5 generations by ubermaker77
No, safety valves were a thing by the 1930s. There is one on the cooker in the picture, and a vent hole, and a lid held by the strength of its seal, designed to fail at a certain pressure. Three failsafes to overcome before catastrophe, and that was in the 1930s.
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