I’ve seen this theorized here and there before, and the theories all made sense, but here it is right from the mouth of Griswold’s marketing department in 1921!
“The Griswold … low frame … is for use on coal and wood ranges, and the high frame … is for oil, gas, or gasoline. Where gas pressure is low use … with low frame … can be used over electricity.”
So, there you have it!
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