I have to make a small correction to the figures I gave regarding the
tuning of Polyphon 62.5 cm [24.6"] disc music box.

In the lower comb for the folding top machine I counted in the not-used
tooth where the disc support wheel is.  So, to compare the folding top
lower comb tuning correctly with that of the 2 uprights, you have to
read tooth nr. 32 = 440 Hz, instead of nr. 33.

Very sorry for that mistake.

Niko Wiegman
The Netherlands