Friday 11 July 2008

Freeze the Balls of a Brass Monkey

It was necessary to keep a good supply of cannon balls near the cannon

on old war ships. But how to prevent them from rolling about the deck was

the problem. The best storage method devised was to stack them as a

square based pyramid, with one ball on top, resting on four, resting on nine,

which rested on sixteen.

Thus, a supply of 30 cannon balls could be stacked in a small area right next

to the cannon. There was only one problem -- how to prevent the bottom

layer from sliding/rolling from under the others.

The solution was a metal plate with 16 round indentations, called, for reasons

unknown, a Monkey.. But if this plate were made of iron, the iron balls would

quickly rust to it. The solution to the rusting problem was to make them of

brass; hence, Brass Monkeys.

Few landlubbers realize that brass contracts much more and much faster than

iron when chilled. Consequently, when the temperature dropped too far, the

brass indentations would shrink so much that the iron cannon balls would come

right off the monkey.
Thus, it was quite literally, cold enough to freeze the balls off a brass monkey.

And all this time, you might have thought this just a vulgar expression.

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