Re: Slide valve versus other valve gears

Hi,

Not a comment on Southern valve gear or its development.

Recall the legal disputed about the telephone. From

"
The Elisha Gray and Alexander Graham Bell controversy concerns the question of whether Gray and Bell invented the telephone independently. This issue is narrower than the question of who deserves credit for inventing the telephone, for which there are several claimants.

At issue are roles of each inventor's lawyers, the filing of patent documents, and allegations of theft.
"

Parallel development is apparently not unknown. Keep an open mind about parallel development in the pre-telephone/telegraph/internet age.

FWIW

Doug vV

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