[r-t] Lead head codes redux

[Don Morrison]

On Wed, Jun 21, 2017 at 4:34 AM, Graham John <graham at changeringing.co.uk>
wrote:
> > (I am presuming "renumber them to work like the even stages" is just
> > shorthand for "renumber the single hunt at odd stages and twin hunt at
even
> > stages ones to work like the single hunt at even stages and twin hunt
at odd
> > stages ones".)
>
> Re-lettering like that would be a much bigger change, but other than
> recording these codes in collections, I am not sure what use is made
> of them. I imagine the biggest impact would be to make the use of
> those letters in printed publications out of date causing possible
> confusion to subsequent readers of them.

I'm sorry, I must have been unclear. I was not suggesting any relettering.
I was just noting that p,q,r,s apply not just to odd stages with single
hunts, but also to even stages with twin hunts. Does your count of 11
methods affected include any even stage, twin hunt methods (it may well be
that the number of affected methods there is naught)?


Which is a suitable segue to a related question: the letters describe not
just the lead head, but also the change across the lead end. While the vast
majority of a-m type lead ends at even stages are the usual, there are two
radically different kinds of lead ends associated with Grandsire lead
heads. I have always presumed that a-m at odd stages refer to the change
*following* the lead head, with the apices of the palindrome as the hunt
bells swap with one another: 3rds for a-f and Nths for g-m; is this
correct? At doubles there are actually (well, I've not counted, but I'm
reasonably confident this is correct) *more* methods that have been rung
that have Grandsire lead heads but have the apices of their palindrome at
the Plain Bob-ish positions.

I suppose another way of looking at this is "are a-m at odd stages and p-s
at even stages only applicable to methods both of whose hunts bells are
principle hunts?"


-- 
Don Morrison <dfm at ringing.org>
"History is a kind of experiment, albeit an imperfectly
controlled one."       -- Steven Pinker, _The Blank Slate_
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