Key Leads and Inertia

[Don]

Hi John,

I can't read the text at the page Please make it larger and less
curvatious. Thanks.

At 06:48 PM 4/24/2003 -0400, you wrote:
>List,
>
>Continuing with the discussion about even balance 
>weight verses even inertia I have another 
>contribution. Actually a clarification of a 
>comment I made before. Please see the illustration 
>on the technicians page of my web site.
>
[link redacted at request of site owner - Jul 25, 2015]
>
>I think this will show what I meant when I said 
>that the key leads help when you play softly but 
>hinder when you play at louder dynamics. I got 
>started thinking about this a few years ago after 
>seeing a class given by Bob Holf. He described an 
>experiment he did using a large scale key model. 
>The gist of the experiment was to discover how the 
>key reacted to varying force. The key's 
>acceleration as measured revealed the influence of 
>inertia.
>
>John Hartman RPT
>
>John Hartman Pianos
[link redacted at request of site owner - Jul 25, 2015]
>Rebuilding Steinway and Mason & Hamlin
>Grand Pianos Since 1979
>
>Piano Technicians Journal
>Journal Illustrator/Contributing Editor
[link redacted at request of site owner - Jul 25, 2015]
>
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

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