A quick prelude:
(from http://en.wikipedia.org/wiki/Stone_%28weight%29) "... The stone is a unit of weight and mass. It is part of the Imperial system of weights and measures used in the British Isles, and formerly used in most Commonwealth countries. It is equal to 14 pounds avoirdupois...."
Imagine a Quality Control procedure for weighing balances whereby each balance is tested with a 'unit' stone, a stone weighing exactly one stone. This unit stone would be loaded onto the balance and balanced against a counterweight or set of counterweights weighing a stone totally. Now,
Q) Why might this procedure fail for balances made of ferromagnetic materials?
A) Because the 'unit' stone being used would be loaded onto the balance, making it a load stone (lodestone).
Hahahahaha! Can you beat that? Can you find a daya-er joke than this?
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