[r-t] Common Grandsire singles in Oxford Bob Triples

edward martin edward.w.martin at gmail.com
Tue May 5 09:09:27 UTC 2009

>> Using grandsire singles in 2 hunt triples methods is effectively a
>> splicing problem, where the out of course leads behave as if they are a
>> completely different method.
I don't think I believe that as a general statement. However, you have
discovered an instance where a set of otherwise bobbed leads of Single
Oxford :
1 0 0 0 X X X
0 1 0 X 0 X X (3rds)
0 0 1 0 X X X (1sts)
0 0 0 1 X X X (5ths)
plain hunt to
X X X 1 0 0 0
X X 1 X 0 0 0 (7ths)
X 1 X 0 X 0 0 (1sts)
1 X X X 0 0 0 (3rds)
could  exist between two common Grandsire singles and produce the same
changes but in reverse.
However, I do not see that this addresses the old problem of how to
get a 5040 of Single Oxford using only common Grandsire bobs &
The structure of the lead block is not symmetrical to the path of the
treble and (except for such instances as you have discovered)
repetition within the lead blocks is, I would think inevitable.

>> Unfortunately these 9 lead sets do not fit easily into one round block.
>> By comparison, Grandsire Triples is a much easier 3 lead splice, with
>> the 3 leads forming a bob course.

That is because the 5040 Grandsire can be set out initially  in 360
bobbed blocks each with a structure that IS symmetric about the path
of the treble. Even so, if common singles are used to include any
block of changes which cannot be joined to the main comp. by using
bobs, then this block MUST have no plain leads in it for these, being
asymmetric, would not reverse to give the original changes.
Eddie Martin

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