Washington, DC: US National Navy Museum and 16" gun pierces 26" armor plating

(Satellite)

Historic Photographs posted
26-inch thick armor from a Japanese Yamato class battleship, pierced by a US Navy 16-inch gun. The armor is on display at the US Navy Museum
Erik Soza: The damage is the result of a 16" US armor piercing naval shell during ballistic testing at the Naval Proving Ground in Dahlgreen, VA.
Jesse Weaver: Zoey Taylor this was at point blank range. Any distance beyond that even AP rounds would have done nothing to this armor.
Jamie Swinburn: By the shape of that armour it looks like it's part of one the faceplates of one of the main turrets.
Charles Berry: Jamie Swinburn you guessed correctly. That's the turret faceplate originally intended for the third Yamato class battleship Shinano, but wasn't used on account of the ship being converted into an aircraft carrier halfway through construction.
Citamrac Aurf

https://youtu.be/T0p-RbC02ps it was never built into a ship, and it was shot at by a 16 inch gun as a test

Micu Lucian Ionel: It was a test. They shot the piece of armor from 133 yards (122 meters) so it's irrelevant considering point blank for the gun used is considered 8400 yards (7700 meters) .

Wade Klaffer shared
Jim Allgren: It’s from an unbuilt ship - Japanese we’re working on a ‘Super-Yamato’ class that weren’t built - armor was recovered post-war, USN used it for a gunnery test.
Jim Allgren: This armor is from a gunnery test. Armor was salvaged from Kure Naval Yard post-war. Yamato and Musashi were both sunk by aircraft, not gunnery.

 

America's Military History posted
U.S. Navy Yard, Washington, D.C., the Big Gun section of the shops, in 1917.
Jonathan Myhre: This is an action shot, notice that many of the gun tubes are actively turning on the lathes. It must have been outrageously loud.
Jim Szczur: Didn’t Watervellet Arsenal in Albany N.Y. make the 16 inch Guns.
Jeff Johnson: Jim Szczur Yes.
Charlie Shanebrook: I think they still have a lathe up there used to make 16-inch guns

magnum
The above 26" armor plate was intended for the face of the turrets. The America's big battleships used 17" armor on the turret faces. The side armor on America's battleships was "just" 12.1".

Photo via Vietnam via Exhibits via Museum
USS New Jersey (BB-62), 2001. A head on view of the forward 16" gun turrets on the USS New Jersey (BB 62), 10/29/2001. Carlos Cintron, Civilian, USAF. (OPA-NARA II-2016/01/07).