S&S D Duplex

[David Ilvedson]

----- Original message ---------------------------------------->
From: <Duplexdan@aol.com>
To: <pianotech@ptg.org>
Received: Thu, 21 Nov 2002 00:20:13 EST
Subject: Re: S&S D Duplex

>Tony Caught,

>Your interest in the duplex scale is of special note to me because of your
>knowledge and experience with other stringed instruments. My own research
>revealed that CFT Steinway did study some amount of violin making in addition
>to having a highly technical relationship with Hermann Helmholtz. This
>suggests that what he learned from the violin makers and HH led him to
>develop the idea of placing the duplex harmonic bridges in such a position as
>to be divisions of the speaking length that are quantified into oliquot
>portions. When the duplex bridge changes its direction it is because the
>scale designer requres a different interval. You may be interested to
>purchase my book  THE DUPLEX SCALE FIELD MANUAL GUIDE,  which is a
>compendium
>of the duplex scales found in the worlds' most popular pianos. $20.00 (over
>15 years of research went into this volume)

>The point I feel you would like to address is that the sustain and quality of
>a speaking length is enhanced when the fundamental of the non speaking length
>produces a tone which is a low partial of the speaking length. This, in my
>experience is 100% true. Steinway said so in 1872, and I have ample reason to
>recommend his opinion to you. So do hundreds of technicians who have taken my
>seminars.

>The bottom line is, Tony, until you try it you won't buy it. But once you try
>it, if you follow the original patent 126848, you will know the answer for
>yourself. If you would like a copy of CFT's patent and mine 5736660 I will be
>delighted to include them in the shipment...add $5. @ plus postage. That's
>all.

>By the way I have an old classmate friend in Austrailia who I hope will some
>day invite me there to play golf as well as invest in a Rumanian soundboard
>factory. I'd love to come to Austrailia and tune some duplexes if I can get
>some tee times. It would be an adventure to visit you to assist in your
>efforts to imporve piano tone, and at the same time visit my classmate Henry
>Spira, in Sydney. The bonus would be if we can cook up a plan to manufacture
>Rumanian spruce into soundboards. if this idea is too far "down under", let's
>just deal with the duplex which is right up front and waiting to be tuned.

>The internet may finally have a worthwhile purpose for the PTG.


>Dan Franklin
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives