Which work out to a change of 3 numbers halves or doubles the cross
section. 6 numbers halves or doubles the diameter.

Dan

Jeff Wisnia wrote:


The first attempt to adopt a geometrical system was made by Messrs Brown
& Sharpe in 1855. They established a regular progression of thirty-nine
steps between the English sizes, No. 0000 (460 mils or about 12 mm) and
No. 36 (5 mils or about 0.13 mm). Each diameter was multiplied by
0.890526 to give the next lower size. This is now the American wire
gauge, and is used to a considerable extent in the U.S.A.

---------

Hope this didn't add to the confusion. G

Jeff
--
Jeffry Wisnia

(W1BSV + Brass Rat '57 EE)

"Truth exists; only falsehood has to be invented."