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.
Faa vertical air speed IT. it spaccato di un variometro en variometer Faa vertical air speed Giggy Umberto NURS PDUSGov Uploaded with Pitot tubes Sensors Variometers Diagrams in Italian
Page 2023 Free-images.com. All images are Public Domain