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Airplanes - Instruments - Close view of the mechanism of the aero altimeter. It consists of 35 parts. Under the action of atmospheric pressure the chamber A rises and carries up arm B which in turn communicates its movement to segments D by means of levers C, the movement laterally of segment D causes pinion and staff E to turn and carry around the hand which is fastened upon the top of E. Made by Aero Instrument Corp., New York City

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