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:
Krupp ton gun Scientific American . en The inch cm Krupp gun weighed tons and was used by Krupp as showpiece for its abilities in gunmaking Michaelis writes in Alfred Krupp sketch of his life page that this gun was featured at the Paris exposition Scientific American October Seitz from photograph PDold Scientific American