ORIGINAL: Wozwasnt
Tank was the code name given to Britains new top secret "Landship" during WWI.
Correct sir, the name "tank" was supposed to disguise these things as water tanks for use at the front by thirsty soldiers.
If they had been smaller, they could have been referred to as "water butts" or just Butts. I know which name I favour.
Heaven forfend, a small tank might have been referred to as a "bucket" even, let's not get back into the tank and bucket issue.[X(] LMAO!
I like the term "tank", it suits these vessels well.