If memory serves, these indicate the points where wire sizes change. Del --------------------------------- Ron Nossaman wrote: > Great! I'll play too. I tuned an Acrosonic and a Hamilton studio yesterday > and took note of where the little 'hash' marks, cast into the plate just > below a row of tuning pins through tenor and treble, fell in the scale. The > Acrosonic had them at the C's and F#'s and the Hamilton had them at F#3, > A#4, D4, F#4, A#5, C6, G#6, and E7. Chip tuning guide markers, I presume? > What other patterns were used on different pianos, and why? > > Ron
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