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:
monochrome text sketch drawing inch Wrought Iron Gun ampquotPlanned by J. Ericsson. Tested at Sandy Hook ampampquot. Photograph of plan on file at the Naval Ordnance Plant Louisville Kentucky circa . This gun looks very much like John Ericsson's ampquotOregonampquot gun after reinforcement. The ampquotOregonampquot was tested at