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Author Topic: Freeze the balls off a brass monkey  (Read 11239 times)

Martin (Admin)

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Freeze the balls off a brass monkey
« on: July 01, 2008, 12:03:30 pm »

Cannon Balls

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 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 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 thought that was a vulgar expression, didn't you?



( I always thought it was something to do with the brass balls outside old pawnbroker's shops! - Martin )
((  Why 3 Brass balls? - http://en.wikipedia.org/wiki/Pawnbroker ))
((( Thanks to Alan Brierly <[email protected]> for sending me this one! )))





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tigertiger

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Re: Freeze the balls off a brass monkey
« Reply #1 on: July 01, 2008, 12:14:15 pm »

At least the Monkey wasn't in Hartlepool. {-) {-)
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andrewh

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Re: Freeze the balls off a brass monkey
« Reply #2 on: July 01, 2008, 04:06:57 pm »

Spot on, but there is much more interest and metallurgy in the story ;D

This cracking happened mainly in the Far East and India service, and is now known to be caused by the (relatively) large and coarse grains of cast brass allowing water vapour (hot monsoon season) to penetrate  the grain boundaries, and when this condensed and froze the balls literally fell off the brass monkey. 
(wrought brass doesn't suffer the same way cos the grains are all squoooooged together and elongated by the rolloing processes)

This habit of brass is known as "season cracking" cos its associated with the time of year and the monsoon seasons.

Imagine firing a brass cannon that has been in a monsoon area for a few years :(

"Admiralty Brass" was (and is) the RN's answer to this problem - it has a grain type that never admits water and hence doesn't suffer from season cracking.

andrew

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djrobbo

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Re: Freeze the balls off a brass monkey
« Reply #3 on: July 01, 2008, 06:47:30 pm »

Hi martin ...the reason for three balls outside a pawn brokers was........TWO TO ONE YOU WOULDN"T GET YOUR MONEY BACK ! :D {-)
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tigertiger

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Re: Freeze the balls off a brass monkey
« Reply #4 on: July 02, 2008, 11:59:27 am »

Hi martin ...the reason for three balls outside a pawn brokers was........TWO TO ONE YOU WOULDN"T GET YOUR MONEY BACK ! :D {-)

And I thought it was about E.T.
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