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Roberson Thompson indicator, 1899

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The Roberson Thompson indicator was designed and built by John Roberson of south Seattle. It was used to measure steam consumption of steam engines.
ID Number: 1964.3433.1
Date: Circa 1899
Physical Description: 1 Instrument, Mechanical; chrome, metal, wood, paper, cotton; Case: 7 in.H x 9.5 in.W x 10.5 in.D (closed)
Place Made: United States of America, NEW YORK, New York
Credit: MOHAI, 1964.3433.1