Original oil and gas trade magazine vintage ad for REPUBLIC FLOW METERS COMPANY, was located at 2240 W. Diversey Pkwy, Chicago, IL. These Meters Had To Be Accurate - Flexible - Rugged. Accurate pneumatic transmitters measure flow and level or various acids in chemical processing plants. Employ the force-balance principle to convert these processes variables into air pressures which vary proportionally. These air pressures become direct measurements and can be conducted to reading instruments or used as measuring impulse for the actuation of an automatic controller. This unique 1950 old petroleum industry equipment magazine advertisement would display beautifully matted and framed.