Do you know the exact definition of the gauge unit? As its not
linearily dependent on the width I wonder what it is.
I haven't been able to find the basis of the American Wire or
Browne & Sharpe Gage. However, there are 6 different metal gage
systems in use (mo re or less) in the US. The B & S is the non-
ferrous metal gage. It goes fro m 6/0 gage (.5165 in) to 50 gage
(.00099in). The ferrous gages are based o n the weight of 1
square foot of steel 1inch thick weighing 41.82 pounds.
Basically, the gage number was how many square feet of metal
agiven thickness could be rolled from 41.82 pounds of steel. ex.
6 ga is .192 in
thick, therefore 1/.1923D5.2083. 1 pound of steel will make
5.2083 sq ft of 6 ga steel sheet. At one time the scheme was
based on a 40 pound steel. Industry is trying to get away from
the gage schemes and go to dimensions in thousandths of an inch.
I'd guess the B&S system is based on some metal other than iron
but I don't know which one, copper maybe.