I would not be surprised to find that mass is a serious consideration for the bass bridge in a big Bozy. I remember looking at the bass bridge on a big Bozy at one of the Annual PTG Conventions and thinking that the bridge was about the size of an average baseball bat. It was HUGE! But then, even if you are building a small piano, you want it to look as much like a big Bozy as is possible. No? Terry Farrell ----- Original Message ----- From: "Jonathan Finger" <johann@tollidee.com> To: "'Pianotech'" <pianotech@ptg.org> Sent: Wednesday, March 26, 2003 10:56 AM Subject: RE: more bridge design Hello David, I think the high end manufacturer you're thinking of is Bösendorfer. I would imagine that less mass in the bass bridge equals a cleaner transfer of energy from the string to the soundboard, but I'm certainly no authority on the subject. Jonathan Finger RPT -----Original Message----- From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf Of Dave Nereson Sent: Wednesday, March 26, 2003 2:43 AM To: pianotech@ptg.org Subject: more bridge design I've noticed on some large grands (I forget which make), the bass bridge will have several large holes drilled through it. I'm not sure why -- I imagine it's to reduce the mass for some reason -- maybe so the soundboard isn't "burdened" with a large block of wood riding on it. Yet, the necessary downward pressure of the strings is also a humongous burden. If I'm not mistaken, this is found only in high quality concert grands, or maybe only in one make. But a few weeks ago, I saw the same feature in an Eavestaff minipiano. This is a little oddball spinet, British company, but made in the U.S. by Hardman, Peck & Co., New York. [I don't know if Hardman made them under contract with Eavestaff or if they made only the ones sold stateside.] It was hell to work on, and I hope I never see another one. But the bass bridge had holes drilled through it just like the Bosendorfer Imperial or whoever it is that uses that feature. Now here the violin bridge analogy may come in again -- i.e., the bridge is not a solid block of wood, but has as many "holes", or open spaces in it as possible. Does anybody know which large grand it is that has the holey bass bridge and what the reason for the holes is? --David Nereson, RPT, Denver
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