Shlomit said,

```
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

or steel,

but I don’t know which one, copper maybe.

Dave