[r-t] Writtle, etc

[Robin Woolley]

Peter King asks about 34-34.1-2-1.34.2.34.1-2-1 as an extension for Writtle
S Minor (34-34.1-2-1.34.2.34.1).

The proffered method breaks one of the axioms of extension, in that an
extension must extend by a whole section. To explain this fully is a
non-trivial problem - it's easy but long-winded.

What Peter suggest breaks the rules by adding something 'new' at the end. In
short, (classical) candidate extensions (below only) are:

SCD 34-34.1-2-1-2-1.34.2.34.1
SEF 34-34.1-2-1.34.2.34.1.34.2.34.1
ECD 34-34.1-2-1-4-1.56.4.56.1
EEF 34-34.1-2-1.34.2.34.1.56.4.56.1

but

SCD is not allowed since it does not preserve any places below the treble -
34 in the parent.
ECD does not preserve all sets of 2nds place - when the treble is in 5-6 is
lost.

I see Peter claims to be a simple chap from Imperial College. There are, as
far as I know, two sources of 'tutorials' on this matter. Either look at the
Ringing World for 1989 June 16 - p563, or ask Roger Bailey for a copy of his
1995 html document. These do not deal with 'extension by modes' (quantum
extension as I call it), but you haven't a hope of understanding this if you
haven't done classical extension first.

I like this as an example - how would you describe an atom to a five year
old? Most likely with little electron balls going round a central ball. You
wouldn't launch into an explanation of wave-particle duality, for example.

If I get time, I'll do a web-page on the extension of this method.

Robin

PS Remember that the rules are fundamentally based on what had been 
acceptable before c1950. This explains why Plain Bob Minor extended to seven 
really is Grandsire Triples - most minor methods extended to triples prior 
to this date had added an extra hunt bell - viz: S. & D. Oxford, Hereward, 
St. Clement's, S. & D. Court, London & College. It is Plain & Grandsire 
which are anomalous, not the other way around.