The 220 mm figure for the roof appears in the "Bismarck Warship Profile 18" by Paul Schmalenbach and also in some publications By Siegfried Breyer.Herr Nilsson wrote: ↑Tue Jun 21, 2022 6:50 amDefinitely wrong. Diregarding the sides it's all Wh. Roof plate is 200mm.fsimon wrote: ↑Mon Jun 20, 2022 9:32 pm to 2) I took this from the book "Battleship Bismarck- A Design and Operational History of William H.Garzke Jr., Robert O. Dulin Jr., and William Jurens (moderator of this forum), with James Cameron, page 43.
There it says: "The conning tower roof plates were 220mm of KC armor, the sides were 350mmm, ...Cylindrical KC armor of 220-mm thickness shielded the communications tube joining this key position with battle stations below the armored deck."
I do not possess primary sources. But I have faith in the honesty and influence of Mr Jurens regarding this book.
I believe it is a typo since I have not found any other source either primary or secondary that provides that data. Gröner and Brennecke (who used Gröner as a source) give 200 mm for the roof which is in accordance with original drawings.
I have now to correct that data on the website protection page!