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Pipefitter's Cap

Does anyone have information on the hats or caps worn by plumbers or pipe fitters at the beginning of the 20th century? I remember Dan showing vintage pictures of tradesman where he said that journeymen wore different hats that the apprentices.
8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

Two btu per sq ft for degree difference for a slab