280 karma · joined January 25, 2019
For the two bolts, this is equivalent to rotating both bolts so the stripe stays in the same relative position, as if one were rotated around the other or they were twisted in the same absolute direction. If you are concerned about symmetry violation because of the direction of the threads, you can reverse the threads on both bolts, with the same result. You can try this with a couple of bolts and a couple of rubber bands to keep them in the same relative position. The illustration is a hint that the motion is equivalent to rotating both in the same absolute direction (near side moving up.) Then view that system from the head and note the direction each would be moving, away or towards you.
If you have to undo a bolt or nut from behind, the bolt head moves in a reverse direction from your viewpoint, just as if you were to view a glass clock from behind.
https://en.wikipedia.org/wiki/MPTP https://en.wikipedia.org/wiki/Tryptophan
open close open close
in both directions.
But now I'm afraid I sound like an audiophile who buys wooden amp knobs for performance.
I first learned about this in vision, but it's generally true. https://www.electronicsweekly.com/news/research-news/add-noi...
Thanks for the reality check.
Edit: Because I would like to know if I can trust any (other than rechargeable or perhaps Li) cells not to destroy my toys.