- Heat sink grease - 6 Updates
- 22" monitor GNR TS2200WA - info? - 2 Updates
| etpm@whidbey.com: Apr 21 10:31AM -0700 On Sat, 21 Apr 2018 15:13:02 +1200, "~misfit~" >Electrolube HTC or, for 'cheap jobs' that need a lot of it and have large >contact areas / raditaors (mostly aluminium LED PCBs to heatsinks), stuff I >get from AliExpress. The reason the glass is so flat is because it is floated on molten tin in order to flatten it. So it should match the curvature of the earth. Though not flat enough to use as a surface plate for much of the inspection work I do it is still very flat and plenty good enough to use with wetordry paper to flatten stuff like the sealing surfaces for air compressor reed valves. Eric |
| Mike S <mscir@yahoo.com>: Apr 21 04:47PM -0700 > use with wetordry paper to flatten stuff like the sealing surfaces for > air compressor reed valves. > Eric Interesting. I remember reading that ocean water is higher near underwater mountain tops due to increased gravitational attraction and measurable from satellites, I wonder if tanks could be designed with non-flat bottoms to counteract what you mentioned. |
| jurb6006@gmail.com: Apr 21 05:19PM -0700 >"Interesting. I remember reading that ocean water is higher near underwater mountain tops due to increased gravitational attraction and measurable from satellites," The would be one hell of a dense mountain to do that, I would think it more likely to be because of a decreased gravitational pull being forced away from the center of mass of the planet, due to its inverse square relationship. But that is not my field of expertise. (is anything ? the more I learn the less I know, if it weren't for learning from mistakes I would be a babbling idiot - NO COMMENTS FROM THE PEANUT GALLERY HERE !) >"I wonder if tanks could be designed with non-flat bottoms to counteract what you mentioned" Pretty sure that would not work because gravity is the leveling force. As such the shape of the bottom should not matter. Perhaps at a high altitude with a very large mass (dense, not voluminous) placed under the center of the tank it could be compensated. But then that makes splitting hairs look like hitting the broad side of a barn with a planet. |
| jurb6006@gmail.com: Apr 21 05:21PM -0700 Actually, maybe a half spherical or hyperbolic shaped tank bottom would work. However that would take a hell of alot of tin. |
| Mike S <mscir@yahoo.com>: Apr 21 05:46PM -0700 >> "I wonder if tanks could be designed with non-flat bottoms to counteract what you mentioned" > Pretty sure that would not work because gravity is the leveling force. As such the shape of the bottom should not matter. > Perhaps at a high altitude with a very large mass (dense, not voluminous) placed under the center of the tank it could be compensated. But then that makes splitting hairs look like hitting the broad side of a barn with a planet. I don't know the correct physics, just read a bit... Satellite observations The alternative is an indirect method that uses satellites fitted with radar altimeters. These spacecraft can infer the shape of the ocean bottom from the shape of the water surface above. Because water follows gravity, it is pulled into highs above the mass of tall seamounts, and slumps into depressions over deep trenches. http://www.bbc.com/news/science-environment-29465446 The Hidden Earth: Undersea Mountains by the Thousands http://www.slate.com/blogs/bad_astronomy/2014/10/07/geography_thousands_of_undersea_mountains_discovered_via_satellite.html |
| Clifford Heath <no.spam@please.net>: Apr 22 10:00PM +1000 On 22/04/18 10:46, Mike S wrote: > http://www.bbc.com/news/science-environment-29465446 > The Hidden Earth: Undersea Mountains by the Thousands > http://www.slate.com/blogs/bad_astronomy/2014/10/07/geography_thousands_of_undersea_mountains_discovered_via_satellite.html Makes perfect sense to me. Consider, the material of the mount must be more dense than water. If its mechanical strength evaporated it would droop down to form a level plain. So there's more mass between the peak and the center of the earth, and more between mean sea level and the center also. More mass, more gravity. It'll pull the sea surface towards itself. Clifford Heath. |
| Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net>: Apr 21 08:30PM -0400 On 04/16/18 17:10, Mike Coon wrote: >> They not only explode they stink up the whole room. > The best stinky component I remember (from decades ago) was the selenium > rectifier! Yup. That horrible smell is also horribly toxic. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net http://hobbs-eo.com |
| Mike Coon <gravity@mjcoon.plus.com>: Apr 22 09:06AM +0100 > Lytics can explode if no such precautions are taken during mfr > NT Now I have remembered that in 1961 between school and college I had a holiday job with Radford's in Bristol, UK, who made PA amps for supermarkets. (Quite a new idea, then, perhaps.) Their snooty designer, fully suited, came to review the first of his new design off the production line, and I was one of the erks in attendance. As he bent over it to inspect our workmanship a large electrolytic exploded and decorated him with confetti. There were a lot of badly bitten lips and choked-off splutters... So I am familiar with the danger, after all! Mike. |
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