Transits are used to measure microscopic movements in a building Chris. Why would you use transits if you can already see a lean?
Because perhaps they were not sure. being professionals, with professional equipment, they checked and found they were right. Furthermore they could check for changes that might indicate immediacy of the problem
Well, we're having trouble agreeing with even visual observation. The firefighters saw bulges, and used a transit to confirm their visual observation. But I just want to ask, do you see the kink in the roofline? Do you see a tilt in the picture? Just questions of observation. Bill? Mrkinney?
I only ever heard about one 'bulge' Chris. The guy said smething like 'we saw a bulge and we put a transit on it' A bulge sticks out from a flatter surface.
i have seen a kink in the roofline the same as what you see when a controlled demolition is performed. Put up your best pictures of the lean and I'll tell you what I think.
'' Captain Chris Boyle
Engine 94 - 18 years
Boyle: ...on the north and east side of 7 it didn’t look like there was any damage at all, but then you looked on the south side of 7 there had to be a hole 20 stories tall in the building, with fire on several floors. Debris was falling down on the building and it didn’t look good.
Firehouse: When you looked at the south side, how close were you to the base of that side?
Boyle: I was standing right next to the building, probably right next to it.
Firehouse: When you had fire on the 20 floors, was it in one window or many?
Boyle: There was a huge gaping hole and it was scattered throughout there. It was a huge hole. I would say it was probably about a third of it, right in the middle of it. And so after Visconti came down and said nobody goes in 7, we said all right, we’ll head back to the command post. We lost touch with him. I never saw him again that day.''
Deputy Chief Peter Hayden
Division 1 - 33 years
...also we were pretty sure that 7 World Trade Center would collapse. Early on, we saw a bulge in the southwest corner between floors 10 and 13, and we had put a transit on that and we were pretty sure she was going to collapse. You actually could see there was a visible bulge, it ran up about three floors. It came down about 5 o’clock in the afternoon, but by about 2 o’clock in the afternoon we realized this thing was going to collapse.''
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