So, I returned to town to rescan a sidewalk r.o.w. that was in the line of several pre-statehood homes. Immediately I began to find older targets. Some where in the 8 to 10 inch range.
It made a tighter fit on the burner tube which the lamp could vent through a second tube directly into the flame There any venting gas would be consumed. Alleviating any pressure in the lamp itself....
George Baldwin 1867
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Gonehunting for History