On 27 Aug 2006 17:58:15 -0700, "philkryder"
wrote:


Does anyone know "the history" of how these numbers came about?

For example, shotgun gauges are based on a pound of pure lead divide
into equal sized spheres...

what are screw sizes and wire and metal gauges based on?


Wire guage is based on how many holes in the draw-plate
you pulled the wire through to get that size.
I'm pretty sure that screw-sized are based on wire-guage.