Lloyd Sponenburgh:
On board most armed ships of the British fleet were triangular brass racks -
low bars of brass forged into an equilateral triangle - mounted to the
decks, into which to stack cannon balls in the familiar pyramid fashion.

I said *prove* it. I have already posted cites refuting this answer.
--
Mark Brader, Short words good; sesquipedalian verbalizations undesirable
Toronto, -- after George Orwell