[ Mark Poole wrote in 160924 MMDigest --

> I have Graham Webb's two books: "The Disc Musical Box Handbook"
> published in 1971 and the second version, "The Musical Box Handbook
> - Volume 2 - Disc Boxes," published in 1984.  The early book shows
> a 24-1/2" Polyphon scale starting with the lowest notes tuned to
> B-flat on both combs, yet the latter book shows the lowest notes on
> both combs tuned to a G.  Can anyone explain?

Hello Mark and all,  although I only know the books from their names,
I do know some Polyphon 24-1/2" music boxes and how they are tuned.
I know that there were machines which were tuned to G major and also
to A major.  So there were indeed different tuning scales of the same
Polyphon size.  Usually, the 19-5/8" and 22" Polyphon music boxes were
tuned to B-flat major.  Hope this was helpful.

Best collector's regards,
Jochen Schäfer - a.k.a. Jochen Kopf at YouTube
Marburg, Germany