Shipbucket

I am curious about much difference in stopping power there was between pre WW1 UK armor and pre WW2 armor?

Might want to look into Navweaps.com articles on such things, table of penetration is a worthwhile comparison tool

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I cant find any comparison chart

Not sure, that there is a "general" article/chart summarizing the UK naval armor evolution between 1900s-1930s era
it's up to you to read all the articles around the web, and to do your own analyzes/summary tables

Major Historical Naval Armor Penetration Formulae
http://www.navweaps.com/index_nathan/Hstfrmla.php

Table of Metallurgical Properties of Naval Armor and Construction Materials
http://www.navweaps.com/index_nathan/me ... pt2009.php

Multi-Plate Armor Versus Single Solid Plates
http://www.navweaps.com/index_nathan/mu ... ePlate.php

Miscellaneous Naval-Armor-Related Formulae
http://www.navweaps.com/index_nathan/Miscarmr.php

Armor-Piercing Shells Versus Armor
http://www.navweaps.com/index_nathan/apShellVsArmor.php

Nathan Okun Naval Gun and Armor Data Resource
http://www.navweaps.com/index_nathan/index_nathan.php

INTRODUCTION TO THE DEVELOPMENT OF WARSHIP ARMOUR
https://www.naval-history.net/WW0Book-U ... ur1937.htm

Evolution of Engineering in the Royal Navy, vol. 1, 1827-1939
https://search.proquest.com/openview/85 ... bl=1819215

You also have to compare many ship-class books (inside, they often detail the armor of ships)







Try to see this book (for the 1860s-1916 era):
https://www.amazon.co.uk/Forging-Fleet- ... 0863212719