There are very few well fundamented sources of information.
Original literature is not always proof. Fake information, which
was launched to mislead competidors, is stil around and the origin
of myths and contradictions like the number of produced instruments,
and whuich is far from the truth.
Similarly many published articles refer to the same uncertain
The phd tesis of Maria Dunkel is a trustable source.
Meantone is beautiful! -
Studies on Tuning of Musical Instruments.
Bern, Berlin, Bruxelles, Frankfurt/M., New York, Oxford, Wien, 2002. 254 pp., num. fig. and tables;
154 exercises with solutions.
ISBN 3-906769-92-5 / US-ISBN 0-8204-5927-5 pb.