Erard under dampers

[Gevaert Pierre]

Hi,

 

I like Stephen Paulello’s wire wich exists in different types an dis made
specially for this kind of pianos. 

 

Here’s the link : HYPERLINK
"http://www.stephenpaulello.com/pdf/Paulello%20cordes%20piano.pdf"http://www
.stephenpaulello.com/pdf/Paulello%20cordes%20piano.pdf

 

It is a french site.

 

Pierre

 

   _____  

De : pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] De la part
de Aras
Envoyé : lundi 28 mai 2007 16:09
À : Pianotech List
Objet : SV: Re: Erard under dampers

 

I would like to ask you people who had worked with Erard what stringmatrial
you use when the original is mostly gone?
We repaired a 240 from 1862 and used the Pure Sound wire (after advice from
museum people), but I cant say that I am really satisfied with it.
For the experiment when some strings broke, we put in Röslau 1½  - 2 less in
gauge in some chores to measure the partials volume. so some notes had one
Röslau and one PS (the 3rd was damped off) This might not be strictly
science, I know. 
Aurally there was not a major difference  I used TuneLab for the measuring
and it came out that the PS wire had hardly any partials but for nr 1 and 2,
a rather "dead" sound while the Röslau was rich in partials but did not have
a modern sound though. 
Anyway, the piano was finished with Puresound and almost a year later the
sound has not become better.
Kaj

John Delacour <JD at pianomaker.co.uk> skrev:

At 12:43 pm -0500 26/5/07, David Doremus wrote:

>Does anyone know a source for flat white felt for these? I need felt 
>tapering from 1 3/4" wide to 3/4" wide, 1/2" or 7/16" thick. It 
>looks like a slot is cut in the center of the strip so it can be 
>folded up and glued into a groove in the middle of the head. Pretty 
>nice system actually if you can find the felt to work with it.

Try Fletcher and Newman . They 
used to supply it but I think it was from Whitehead's Royal George 
works, which is now defunct. Perhaps Laoureux does it. The French 
denizens of the list might have more information.

As to the stepping of the felt, there is no cutting involved. I have 
posted some pictures of the way I have always done it, which is as 
near as you'll get to the process used by the original makers. 
They've forgotten how to do it now and stitch the felt instead, which 
is not nearly as good. The URI is:



The dampers illustrated are actually from a Kirkman, which has one 
long stepped felt in the treble and two pieces further down. It is 
the first you are interested in for the Erard etc.

Unfortunately I have not taken a picture of the main press that I use 
to create the stepping after working the glue into the strip and 
before applying the under-cloth, but if you ask me I can tell you how 
to make a simple press that will do the job.

The process is as follows:

1 cut the felt strip at an angle /__\ so that when the under side 
(top side on the Erard!) is pressed in the sides will be vertical |/\|

2. Twist a pencil to make a dot centrally every 4 inches or so along 
the exposed (wider) side of the felt as a guide for the press.

3. Turn the felt over (narrow side up) and run a line of white glue 
along the centre.

4. Drag a stout needle (say No. 23 piano wire) several times along 
the line of glue, pressing hard so that as the felt springs up again 
it absorbs the glue.

5. Line the strip up in the press and screw down, leaving the felt 
under pressure for a few hours to allow the glue to set, but not 
quite hard, since you need some flexibility to make the hump in the 
middle

6. Stick on the under-cloth, leave to dry and then trim the cloth 
flush with the felt using a very sharp curved knife

7. Use a second press to form the hump, as illustrated.

8. Mark a line along one edge of the undercloth to indicate the 
front, and cut up the strip into individual damper felts.


JD




 

  

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"http://se.meetic.yahoo.net"http://se.meetic.yahoo.net

 

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