Technical #5

[Jim Coleman, Sr.]

Hi Ron:

On the Baldwin pianos, the little bosses mark the wire size changes. On
other pianos there are some little bosses at the Bass end and Treble end
to mark the strike line. The Walter pianos have little bosses underneath
the pressure bar to limit how far down the pressure bar should be screwed.
Also on the Walter piano there is a round boss in the middle of the plate
web just behind the strikeline. This locates a checking jig for locating
tooling holes and a check on the tuning pin locations and a note spacing
jig.

The earliest bosses I have ever noticed for locating the strike line was
on an early 1900 Ivers and Pond upright which was a very high quality piano.
Action height could be located from these bosses and the proper height 
location for side-gluing was assured.

Jim Coleman, Sr.

On Fri, 30 Oct 1998, Ron Nossaman wrote:

> >I am putting these questions on in an attempt to help get the list back to
> >the more interesting things.
> >
> >Jim Coleman, Sr.
> 
> 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 
> 
>