Nigel Davies, historian, posted an interesting article, on comparing military technology in World War 2 (for example, with respect to things like the capabilities of the US and British navies at the start of the war, when "start of the war" was 1939 for Britain and 1941 for the US). Good reading for the military buffs.
World War Two Naval statistics - Comparing Apples with Oranges Thanks to
erudito for the link.