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  • 1.  Harpsichord equations for breaking % and inharmonicity

    Registered Piano Technician
    Posted 12-05-2021 11:58
    List,

    We are working on harpsichord scaling spreadsheets and need metric equations (and constants) for breaking % and inharmonicity. We understand that there are several possible wire choices such as red brass, yellow brass, steel, etc,, each with its own property characteristics.

    Thanks

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    Nick Gravagne, RPT
    Mechanical Engineering
    Nick Gravagne Products
    Strawberry, AZ 85544
    gravagnegang@att.net
    928-476-4143
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  • 2.  RE: Harpsichord equations for breaking % and inharmonicity

    Posted 12-05-2021 12:33

    Consult Stephen Birkett.

     

     






  • 3.  RE: Harpsichord equations for breaking % and inharmonicity

    Registered Piano Technician
    Posted 12-05-2021 16:37
    Resources:
    Paul Poletti, Malcolm Rose, Jean Louchet, Marc Vogel and Carey Beebe would be worth consulting along with Stephen Birkett. 


    In the Stringing/Scaling Materials library, you will find a spreadsheet labeled "Collin" that has some break point info).

    Regards,
    Fred Sturm
    "When I smell a flower, I don't think about how it was cultivated. I like to listen to music the same way." Mompou






  • 4.  RE: Harpsichord equations for breaking % and inharmonicity

    Registered Piano Technician
    Posted 12-12-2021 20:05
    For formulae on harpsichord inharmonicity, see Patrizio Barbieri's article. Thomas Donahue apparently did his own string break point tests on many wires, including Rose, Instrument Workshop, Birkett, Zuckermann, Vogel, Voss. They are documented in an appendix to his book, The Harpsichord Stringing Handbook.

    Bottom line, though, is that there hasn't been a lot of research in that area. I strongly suggest reading Donahue's book as a first step.

    ------------------------------
    Fred Sturm
    University of New Mexico
    fssturm@unm.edu
    http://fredsturm.net
    http://www.artoftuning.com
    "We either make ourselves happy or miserable. The amount of work is the same." - Carlos Casteneda
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