Joe wrote: >At present, I know of no scaling program that has the mass >coefficients for "Iron Wire", so that breaking strength can be calculated >for this wire. Well Rose C is actually not iron - it is carbon steel, and pretty hard modern stuff too, nothing like historical steels. I agree for something like an 1840 piano there isn't much choice at the moment, at least not commercially available wire. As for breaking strengths these are published by Malcolm Rose, but they can easily be tested. If you'd like to learn something about historical soft _iron_ wire (pre 1830 or so), I have an article at http://real.uwaterloo.ca/~sbirkett Follow the link to "historical materials" then "wire" then click on "article". At the moment there is no modern wire that comes even close to he characteristics of historical iron wire. For soft iron there is no single breaking strength that can be calculated, Joe, because it depends on many factors in the drawing process - this has to be determined for samples wires. Also breaking stress is quite noticeably dependent on diameter, much more so than for carbon steel wire. Stephen Stephen Birkett Fortepianos Authentic Reproductions of 18th and 19th Century Pianos 464 Winchester Drive Waterloo, Ontario Canada N2T 1K5 tel: 519-885-2228 mailto: sbirkett@real.uwaterloo.ca http://real.uwaterloo.ca/~sbirkett
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