McFerrin gives 70% of breaking point is the elasticity limit. The breaking point is given as a range. In his book, "The Piano--Its Acoustics" the breaking range for #13 is 273--285 lbs. I would use the lower value. Seventy percent then is 273 t imes .70 or 191 lbs. The ultimate authority would be data the wire makers themselves provide. ---ric >>Also what is the elastic limit of piano > > wire? >>thank you Stuart Balsillie
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