As I look at a CFC from my armchair, I observe that it is so bright that I cannot see the spiral structure. Presumably the receptors in my eyes are saturated.
Yet when I look away, I find that in the afterimage, the structure is clearly evident. Apparently receptor saturation is not such a simple process.
That is, something invisible in the image is visible in the afterimage.
Not sure what, if any, significance this has, but if there's a Nobel prize in it, I could do with the cash.
Sylvia.
Do that long enough and you might go blind!
Try this some time:
Get a serious photoflash, 100 joules maybe. Get dark adapted, and look at a newspaper or some other detailed object at short range. Flash it. The sequence of afterimages is amazing.
John
**Where do you find a CFC that has a spiral structure? All the ones I've found are either folded tubes or helical structures.
I hate it when people confuse the helix (like a lighthouse staircase) with the spiral (like an LP groove).
Pedant mode [OFF]
-- Trevor Wilson www.rageaudio.com.au
cannot see the spiral structure. Presumably the
evident. Apparently receptor saturation is not such
it, I could do with the cash.
I just tried that and I couldn't see the keyboard key labels for the afterimage....
The colours reverse in afterimages, too.
"Stupider than Anyone Else"
** CFC = Collingwood Football Club ??.... Phil
**Like her mistaking a helix for a spiral, I believe she is talking about CFLs.
-- Trevor Wilson www.rageaudio.com.au
Chlorinated Fluorocarbon????
Cheers! Rich
I dunno either - I thought Chlorinated Fluorocarbon.
Maybe Sylvia will tell us.
Thanks, Rich
"Trevor Wilson"
** Outside the narrow worlds of math and science - the correct word IS spiral.Makers all call their helical CFLs " Spiral ".
We have " spiral staircases " and leaves "spiral down" as they fall from trees.
Bloody pedant.
..... Phil
Compact fluorescent lamp.
-- Bill Sloman, Nijmegen
Here's one I saw on another group today.
However, the usage of "spiral" in the sense of a helix is one that is included in the Macquarie Dictionary. You may not like it, but it is one of the meanings that the word now has.
Sylvia.
Yes, I got it wrong. Others managed to figure out what I intended for themselves.
Sylvia.
Given the definition of the word "enough", I'd have thought it was a certain outcome, so why the weasel word "might"?
Sylvia.
No, Combined Federal Campaign...
On a sunny day (Sat, 22 Jan 2011 00:03:04 -0800) it happened Robert Baer wrote in :
FYI google gave "Chinese Footbal Club" as the first link.
themselves.
It was pretty obvious to anone with a brain what you meant. I thought it was just a typo.
Mistaking ? Funny that you would think that. Have you ever seen a spiral-bound notebook ? The wire bit doesn't look like a spiders web.
in the Macquarie Dictionary. You may not like it,
Traditional geometry describes a spiral as a flat figure (the Spiral of Archimedes) and a helix as like the threads on a bolt. But common usage has mixed them up, hence the spiral-bound notebook etc.
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