Reply #136: Did you mean the late 1960's?

[Make7]

Because it looks like Patent #3,605,953 for the viscoelastic damper used in the WTC was applied for in 1969 and granted in 1971. It was also a continuation-in-part of an application filed in 1968 according to the documents.

Be that as it may, you have not really addressed the question. What would be the purpose of using viscoelastic dampers if there was a concrete core? My understanding is that the dampers helped reduce the amount of flex of the steel core in the wind to acceptable levels. This would not appear to have been necessary if a concrete core was used specifically because a steel core design would have flexed too much.

Posted by Christophera:

I belive the scan to be from the Oxford dictionary.

My question was really more concerning what the original source was that they used for the information contained in that entry. Without knowing where the information came from, and whether the source was in a position to actually have specific knowledge regarding the issue in question, I don't really think it can be considered confirmation of a concrete core.

It is just one more quote to counter balance the quotes referring to a steel core.

- Make7