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:
John Frost colour. Photograph of Jack Frost John Carver Meadows Frost at work in his Avro Canada laboratory photo He demonstrates the Coand effect Pressurized air flows out of the end of the red tube and then over the top of the metal disk The Coand effect makes the air stick to the disk bending down at the edges to flow vertically