Re wire draw plates, I have only just re-joined the
list so the following point may already have been
made. A fragment of iron with holes found at
Buchlyvie broch in Stirlingshire, c. 1st cent. AD, was
diagnosed as a possible draw plate in the Proc. Soc.
Antiq. Scot. report Euan MacKie.
--- Keith Hunt <[log in to unmask]> wrote:
> In a message dated 11/03/2006 16:22:34 GMT Standard
> Time, [log in to unmask]
> The first description of a draw plate is given in
> Theophillus' On Divers
> > Arts - about 1100 AD, but his description is a
> bit vague - a thin plate
> > narrowed at top and bottom.
> Vague and ambiguous.
> As I visualise it this could have been the
> description of a plate that was
> either :-
>  six sided in plan view or
>  tapered at both ends in section.
> But how about the two of the latter - i.e. two
> chisel edged plates [with
> notches in which the wire runs] pushed together so
> that they overlapping
> slightly ? As they wore on the wire the applied
> pressure would tend to compensate as
> long as the plates could slide relative to one
> another. Rotating the wire
> through 90 degrees [or whatever] for the reverse
> pull should have kept it
> roughly circular.
> When the notches became too deep a simply move to
> another position along the
> edges would start new notches.