[Bell Historians] Bell profiles

[George Dawson]

I routinely do Elphick trapezia (if thats the right word) when I inspect,
though I dont have many of Taylor rings

GAD


----- Original Message -----
From: "David Bryant" <djb122 at y...>
To: <bellhistorians at yahoogroups.com>
Sent: Sunday, February 17, 2002 12:04 PM
Subject: Re: [Bell Historians] Bell profiles


> I believe Taylor's only usually lengthen the waists of the trebles of
> heavier rings, hence they probably didn't at Towcester.
>
> David
>
> Bill and Margaret Hibbert wrote:
> >
> > Is there anyone out there attempting to measure the shapes of bells.
> > The
> > only written reference to this I am aware of is Elphick's trapeziums
> > (see
> > Craft of the Bellfounder). I have recently taken measurements of two
> > peals -
> > Towcester and Imperial College - and I have uploaded plots of the
> > trapeziums
> > to the photos page. Unlike Elphick, as well as mouth radius, shoulder
> > radius
> > and shoulder height I have also tried to estimate crown height, though
> > I am
> > not yet happy with the way I do this. All the plots are normalised to
> > unit
> > radius at the lip.
> >
> > The plot of Towcester shows that all twelve bells are remarkably
> > similar in
> > shape, despite the front four being almost a century newer. On the
> > other
> > hand, the two trebles at Imperial are much taller than the back eight,
> > which
> > is obvious as soon as you look at them in the tower.
> >
> > I'm doing this, of course, as a precursor to investigating how profile
> > affects sound and in particular partial intensity. Before doing this
> > it
> > would be interesting to know if anyone else is taking similar
> > measurements.
> >
> > By the way, if anyone doubts what enormous differences can be found in
> > bell
> > profiles and sizes, I suggest they look at the picture of the
> > 'Gilletts'
> > peal at Bow on Dickon Love's London bells website - especially the
> > back five
> > (three Gilletts, two Lester and Pack).
> >
> > Bill H
> >
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