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If the wall fixing had a small amount of a gamma-emitting nuclide like Cobalt-60 or Strontium-90 embedded* in it, then a piece of radioflourescent plastic applied to the front of the item to be hung would show a visible glowing spot as it moved over the fixing; the radiation will penetrate the material and give you an exact positioning cue, in X, Y and Z axes. |
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*You can't make the whole thing from them, as those metals have unsuitable mechanical properties. |
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// constantly find new applications for them. // |
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[kdf], you need to get out more and meet other humans. |
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Coming from us, that advice should worry you. Lots. |
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That's no fun, he's more deserving of pity than condemnation. The whole idea has a flavour of Scott Adams' "Engineers Explained" about it ... he actually mentions picture-hanging. <link> |
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Aw, we did that three Saturnalias ago, with the Intercalary's novelty nutcracker. Oh, how we laughed ... |
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I have rare-earth magnets holding up a piece of finish trim
wood on my basement ceiling. As the area was in front of a
crawl window and hiding water pipes, a gas line, a cable or
two, and the Case-Western ARPAnet trunk line, removable
access was important. |
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Murphy's law, it will find that nail/screw that missed and was plastered over without removal. |
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