I'm looking at Roberts' formula for breaking point and he gives the maximum as t(max) = .557d^1.667 He then gives an example of a string at whose tension is 447 lbs and whose calculated T(max comes in at 556 lbs. He then says that this falls within the prescribed maximum of 60% of T(max). Seems to me that 447 is 85% of 556. Is the formula he gives incorrect? David Love davidlovepianos at comcast.net
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