[r-t] Symmetry, bluelines and differentials

edward martin edward.w.martin at gmail.com
Thu Feb 22 03:10:51 UTC 2007

Also, presumably since the stucture of one half is the reverse of the
other, surely, the row generated by x or any other PN at the half or
full lead, will still mean that each bell must retrace the path of
some other, if not its own


On 21/02/07, Ben Willetts <ben at benjw.org.uk> wrote:
> On 21/02/07, Don Morrison <dfm at ringing.org> wrote:
> > For normal methods, possessing the usual symmetry about a half-lead in
> > the changes results in the blueline for all the working bells also
> > possessing a similar symmetry.
> >
> > But in differentials this isn't quite the case. For example, consider
> > the differential formed by having cross instead of places at the lead
> > end and half lead of London Major:
> Having the cross change, instead of places being made, removes the
> 'pivot point' and means that (a) one lead can't be its own reverse,
> and (b) consecutive leads can't be reverses.  This presumably has
> something to do with it.
> Ben
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