Canon PowerShot G9
ƒ/4.8
44.4 mm
1/20
200
The seismic retrofit underway outside my window feels like an architectural root canal.
The whole building was resonant with the drill today.
8 responses to “Welding Sparks”
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no no.. dont tell us its welding or grinding….
Much better to say you visited the Cerne particle accelerator in Switzerland this week and took some snaps of passing particles while the guys were woking on calibration…. Is that wrong? -
The spark traces are roughly 15cm long (from a comparison with the hand). The exposure was at 0.05sec. Therefore, the speed of the particles is approximately equal to 3 m/s. An interesting speed for the eye. How long did you see the traces? Do you remember?
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Oh, no problem… I like the subtle group invites with the one-click add button. It’s just the page long Vegas strips that go too far…
ChrisRudge: heh, have not been to Cern to collect black donut holes.. but I did see the craziness at ORNL.
heet_myser: I am not sure of the terminology but it’s major. Pulled out a bunch of outside columns. Dug 30 ft shafts for cement+rebar. Put a huge cement weight underground connected to the shafts. And that is repeated all around the exterior perimeter. These ground anchors are being connected with vertical columns to the steel I-beams you see here running across the ceiling. External walls, where there is no glass are having cement+rebar lathered on the outside.
Skeptical: Not sure. The retinal burn will override the physics of the moment methinks. I tried to look just at the camera screen and not directly at the UV-rich light.
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When we earthquake proofed our old house in Seattle it took an afternoon. The main thing was to toenail the joists in the basement to the foundation sill. Apparently a common failure mode for older wood frame houses is they jump off their foundations and land askew, with the joist ends hanging in mid-air. Structural failure ensues. Amusing that the house is just fine until it lands.
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