> Carol wrote: Regarding equal temperament in the 18th
century, I suspect that what may be meant is a temperament playable in all
keys.  

Of course. Btw., this has been fully discussed in the recent past in the
list.

> Owen Jorgensen believes that there did not exist a "perfect" equal
temperament until into the 20th century. 

Jorgensen's ideas about the matter were shown to be pure fantasy by
different scholars, for example read Fred Sturm 

https://www.researchgate.net/publication/283212906_Owen_Jorgensen's_Lost_Art
_of_19th_Century_Temperament_-_A_critical_evaluation_of_his_sources_and_meth
odology_in_the_context_of_a_review_of_his_1991_book_Tuning

All the temperament scholars I have been in contact with (such as our Ibo
Ortgies, Mark Lindley, Patrizio Barbieri) share Sturm's criticisms about the
late Jorgensen's fantasies. 

This has ALSO been fully discussed in this list, not long ago.

CDV


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