[r-t] Asymmetric Doubles

[Leigh Simpson]

> Surely the origin of the term "single" is from single change?
> Presumably originally minor where it is essential (for extents in many
> methods), actually a single change and would also have been rung widely
> around the time the term was coined.

Are you sure it wasn't for Grandsire Doubles - where the parity requires a
single change to produce the extent?

Leigh
(happy to be contradicted by actual historian types)