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:
HMS Gannet forecastle compartment with gun. HMS Gannet Compartment contained RML pounder cwt muzzle loading rifled gun which could be moved on the rails set in the deck to fire through the ports visible either side Ship is preserved as museum ship at Chatham Dockyard Kent UK Composite image from two joined exposures taken by