Reply #329: Core Was Never Visable After The 7th Floor, New Video Has No Core Images

[Christophera]

The 1990 video had the concrete core, and some later videos as well.

The latest videos do not show the concrete core. The narration of the 199 video noted how difficult it was to find good film of the core. The best images of the core were from still photos. Short scraps of 3 to 4 seconds would show enough of the concrete/reinforcing bar/forms in away to show the cast concrete. The narration was all about the core and a sense of mystery was imparted to it.

The 1990 video showed the beginning phase described inthe usenet comment below. The construction sequence changes from what Jebson describes so that the concrete core was built inside the steel structure of the "outer tube" after the construction was 7 floors up and the inside faces of the interior box columns could be used to support the exterior core concrete forms which hid the concrete from view.



Here is a usenet comment that describes the first phase and the core visability.

"Tony Jebson" <[email protected]> wrote:

>......Apparently, the WTC towers had no internal
>structural columns but relied on the exterior structure for
>support / strength. No doubt the impact of an airplane does
>this no end of harm.
I worked in downtown NY in the late 1960's when the towers were
built! At lunch time we went to the construction site to watch the
progress. And we saw them first buildt an internal thick walled
rectangular concrete core inside which later the elevators ran. The
steel work was erected around this core several floors behind!

-=tom=-

Here are more usenet comments about the core.

http://cosmicpenguin.com/911/chrisbrown/corerefs/index.html