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:
Engineering technician Robin Brese adjusting dials of energy of hot water heater. National Institute of Standards and Technology National Institute of Standards and Technology The images in the Aeronautical Instruments Photographic Collection are in the public domain and are not subject to copyright in the United States However please