This image was acquired from
flickr. 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:
blackandwhite monochrome black and white NH First Rotating Beam Radar megacycle radar used for transmitting and receiving Developed by the U.S. Naval Research Laboratory NRL in . Official U.S. Navy Photograph from the collections of the Naval History and Heritage Command. NH First Rotating Beam Radar megacycle radar used