Interesting article on how they manufactured the big guns back in the day. Not an easy process whatsoever. THE MANUFACTURE AND CONSTRUCTION OF HEAVY NAVAL GUNS.
Interesting article. Only jarring note (for me, anyway) was the lack of spell-checking detracted from the professorial feel.
Ride in the Wayback Machine https://web.archive.org/web/20150614031306/http://www.battlecruisers.org:80/HeavyGun.htm