From: sylvia@email.invalid   
      
   On 30/07/2019 4:49 pm, Nicolaas Vroom wrote:   
   s.   
   >   
   > If you drop an hourly glass, which internal operation is based on gravity,   
   > during the fall the internal glass particles will not move towards the other   
   > container, thereby increasing the cycle time i.e. the time that one container   
   > becomes empty and the hourly glass has to be turned over. As a consequence   
   the   
   > hourly glass will run slower (just like a moving clock). All this is physics   
      
   An hours glass just doesn't work when it is in free fall. While   
   certainly a consequence of physical law, its failure has nothing to do   
   with the relativistic slowing (in another frame) of an otherwise   
   functioning clock. I can make the other clock stop by hitting it with a   
   hammer. This has similarly nothing to do with relativity, but serves to   
   emphasise that real clocks are designed to function within certain   
   constraints, and cannot be expected to give valid results outside those   
   constraints, with one typical constraint entailing not being hit with a   
   hammer.   
      
   >   
   > What is also interesting is that the behaviour of a clock is influenced   
   > by the speed of light (photons) and an hourly glass by the speed of gravity   
   > (gravitons). Both are also influenced by external (temporary induced) forces.   
      
   The behaviour of the clock in a different frame depends on the universal   
   constant c. Light travels at that speed, but photons are not causing the   
   relativistic effects.   
      
   I have no idea what is meant by "induced forces". It sounds like   
   something that has been made up.   
      
   Sylvia.   
      
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