Original oil and gas trade magazine vintage ad for THE BROWN INSTRUMENT COMPANY. Main office and factory was located at 4456 Wayne Ave., Philadelphia, PA. Now I Can Read How Much Steam! Brown Electric flow Meter on the Inductance Bridge Principle. Records steam, water, gas, air and oil, not just the rate of flow, but the actual amount of steam,water, gas, air or oil produced, delivered or consumed, recorded simultaneously with the flow record, and on the same chart. Unique 1928 old petroleum refining process industry equipment magazine advertisement would look sensational matted and framed.