Insights Relativator (Circular Slide-Rule): Simulated with Desmos - Insight

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The discussion centers on the Relativator, a circular slide rule sold by Atomic Laboratories, Inc., which is linked to Cenco Instruments. Participants express admiration for the device, noting its complexity and advanced features compared to traditional slide rules. The tool is highlighted for its unique capabilities in simulating relativistic calculations using Desmos. Despite its sophistication, some users find it challenging to fully grasp its functionality. Overall, the Relativator is recognized as an impressive and innovative instrument in the realm of physics.
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This is an update of my 2006 post (reconstructed in 2014) Relativator: The circular slide-rule for physicists.

This is a circular slide-rule for doing relativistic calculations for elementary particle physics that I learned about from
– an article by Elizabeth Wade ( “Artifact: Relativator”, Symmetry (FNAL/SLAC), 01/01/06
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What a cool gizmo!! :smile:

EDIT: I mean I thought a slide rule was smart, and I was of course aware that there we're specialized versions, but this one takes the biscuit! Unfortunately it's too advanced for me. Still, I'm flabbergasted! (For the record, the likes was from before this EDIT.)
 
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Thread 'Jackson: justification of the Poynting vector by GR'

The Poynting vector is a definition, that is supposed to represent the energy flow at each point. Unfortunately, the only observable effect caused by the Poynting vector is through the energy variation in a volume subject to an energy flux through its surface, that is, the Poynting theorem. As a curl could be added to the Poynting vector without changing the Poynting theorem, it can not be decided by EM only that this should be the actual flow of energy at each point. Feynman, commenting...
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