Thank you Peter, though for the latest versions of the Hale, seamless "atlas
metal" (bessemer steel) tubing was used rather than tubing made by forming
iron sheet and welding the seam like the earlier versions.
I'm leaning toward the straight Birmingham Wire Gauge values myself as it is
a bit thicker than SWG. Since the change over to SWG postdates the piece we
are replicating I don't believe I need to worry about it.
Thomas Powers
> I cannot believe that the iron sheet being produced in the Black Country in
> 1873 with "W.G." thicknesses was not using the Birmingham Wire Gauge.
> (Adverts in Griffiths Guide) Whether and if/when they changed to S.W.G. I
> don't know. It wouldn't surprise me if they didn't because this would mean a
> new set of gauges.
>
> Other areas and works may have used their own standards. I believe S.W.G.
> was intended to sort this out and did so for copper wire. I remember being
> told when I started work in the 1940s that SWG was not for steel wire but I
> cannot remember who told me that.
>
> Peter Hutchison
Thomas Powers
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