This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Aircraft venturi . pair of venturi tubes mounted on the side of light aircraft's fuselage Venturis were used on small aircraft as means of providing suction for airdriven gyroscopic instruments such as the artificial horizon and directional gyro Modern light aircraft are fitted with enginedriven pumps to provide suction These tubes