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I found these weird "upcicles" growing out of chain link fence posts near Lechmere in #CambridgeMA! I've seen them a few times, and they're *super funky*.
How the heck do these form? Are they in fact a large version of the ice spikes that sometimes form on ice cubes?
See thread for more details.
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The posts in this chain link fence are 4 foot long steel tubes, with walls about 1/8 inch thick. Pretty sturdy.
...except they filled with water, which froze to ice, and that ice has about 10% more volume than the water, and ice apparently don't care overly much about how the steel feels about the matter.
I feel like this might have some bearing on why I've been seeing the weird ice spikes growing
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I was playing around with a diffraction grating (a child's toy, "rainbow glasses") and decided to look at some LEDs to see if I could tell how smooth or bumpy their spectral output was—I'd heard that cheaper white LEDs tend to have a sharp peak in the blue and a large, wide peak around green/red.
And that's what I saw: A dim region between blue and green. But it's also *narrower* there, which I di
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I found these weird "upcicles" growing out of chain link fence posts near Lechmere in #CambridgeMA! I've seen them a few times, and they're *super funky*.
How the heck do these form? Are they in fact a large version of the ice spikes that sometimes form on ice cubes?
See thread …
Ice spikes are back, baby!
No ice spikes so far this year. Not much rain and snow, so I guess not too surprising...
...but also, 4 of the 6 posts I checked have ruptured! I don't have ready access to inspect the others, but I wonder if most of them are like this now…
The posts in this chain link fence are 4 foot long steel tubes, with walls about 1/8 inch thick. Pretty sturdy.
...except they filled with water, which froze to ice, and that ice has about 10% more volume than the water, and ice apparently…
I thought these were all on the same side of the posts, but looking back, that's not true at all. I was thinking about sun direction, and wind, and such... but it might actually be random.
So are these kin to the ice spikes seen in ice cube trays? They're so big! And they're not freestanding, but are instead all stuck to the inner face of the posts.
How would they grow? It looks like they were pushed up out of the post and t…
Every upcicle is against one wall of a hollow metal post about a meter tall. I see water in there, but maybe 15–20 cm down. (Maybe that's ice too?)
The ice inside the post generally has a lenticular cross section with one arc flat against …
I was playing around with a diffraction grating (a child's toy, "rainbow glasses") and decided to look at some LEDs to see if I could tell how smooth or bumpy their spectral output was—I'd heard that cheaper white LEDs tend to have a sharp…
3. Diffraction:
...I'm really hand-waving on this one, but I wonder if diffraction across the fingerprint ridges could cause the weird zigzag shadow I sometimes observe.
Maybe I could try replicating with various smooth vs. ridged objects.
2. Overlapping shadows:
When my fingers are almost touching and there's a visible gap, the halo of blurred silhouette around each one overlap with each other. This could cause the appearance of a lenticular shadow between them. I'm not sur…
1. Light blur:
If my fingers are actually overlapping along my line of sight, then if they were perfectly in focus, I would see them appear to be actually touching. (One finger's almost-contact-point slightly behind the other's.
If that is…
I have a few possible explanations for this shadow-bridge:
1. Light blurring an actual overlap
2. Overlapping shadows
3. Diffraction
These would show up in different situations. It's just hard to distinguish them because in the time it tak…
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