Image: QF 4 inch Mk XII gun on T class submarine AWM 306479

Description: AWM caption : "DETAIL VIEW OF A 4 INCH MARK XII GUN 0N A ROYAL NAVY S.I SUBMARINE MOUNTING IN ACTION." This appears to show a QF 4 inch Mk XII gun, on an unidentified T class submarine.
Title: QF 4 inch Mk XII gun on T class submarine AWM 306479
Credit: This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing for more information.
Author: photographer not identified
Permission: This image is protected by Crown Copyright because it is owned by the Australian Government or that of the states or territories, and is in the public domain because it was created or published prior to 1973 and the copyright has therefore expired. The government of Australia has declared that the expiration of Crown Copyrights applies worldwide. This has been confirmed by correspondence received by the Volunteer Response Team (Ticket:2017062010010417).
Usage Terms: Public domain
License: Public domain
Attribution Required?: No