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seen Apr 1 at 11:28

Apr
1
comment Equal hourglass levels blindly
Sadly, this even won't work at all. There is less sand as one full bulb in total in the glass, so the level would equalize just until it drops below the passage in both bulbs.
Apr
1
comment Equal hourglass levels blindly
The shaking idea sounds plausible. However, trying it on a real hourglass revealed that the sand is quite stable in a certain position, thus it moves in short intervals and calms down inbetween. Using a strong vibration or constant quite agressive knocking on the glass would give the desired result it seems... but this is not so practical as it takes a long time of aggressive movement.
Apr
1
awarded  Editor
Apr
1
revised Equal hourglass levels blindly
added some examples to give some clue what I'm looking for
Mar
27
asked Equal hourglass levels blindly
Feb
20
asked Bottom magnetic levitation
Nov
5
comment diesel steam engine
The question is more about if the engine could be driven by external heat instead internal combustion... It is part of the idea to heat up the cylinders by external combustion, by fuel, gas or wood...
Nov
4
asked diesel steam engine
Aug
24
awarded  Scholar
Aug
24
accepted light ray 'entropy'
Aug
15
awarded  Nice Question
Feb
17
asked Erratic light spot in optical projection
Feb
17
comment maximum positive electric charge of solid body
What kind of setup could achieve that charges?
Aug
18
comment maximum positive electric charge of solid body
Are those $Vm^{-1}$ values theoretical ones or in reach for experimental techniques?
Aug
18
asked maximum positive electric charge of solid body
Aug
16
answered Why we don't see long range airborne CO2 lasers?
Aug
16
awarded  Supporter
Aug
16
comment Density and statistical models for visible air dust
Yes, there are definitely 'large' particles involved, like dust and mist drops, which may be invisible to the bare eye, but are visible as single particles if illuminated brightly. So I think my question is not so much about the scattering details but more about the statistics of particles in the air, their size and their reflection ability (maybe just their 'color'?).
Aug
15
asked Density and statistical models for visible air dust
Apr
8
comment Trapping a lightray
I think the MathOverflow answer state that there is a solution for a trapped photon between surfaces, but no need for an 'entry hole' like we have here. If we have a hole, the beam cannot be trapped in a finite reflection cycle (it would hit the hole again) but must hit a new spot after every reflection. This however should be possible, if the locations in the alternating reflection sequence approach two limit points.