XPost: sci.electronics.design   
   From: nospam@de-ster.demon.nl   
      
   Bill Sloman  wrote:   
      
   > On 25/02/2026 1:15 am, J. J. Lodder wrote:   
   > > Bill Sloman  wrote:   
   > >   
   > >> On 24/02/2026 10:40 pm, J. J. Lodder wrote:   
   > >>> Bill Sloman  wrote:   
   > >>>   
   > >>>> On 24/02/2026 4:26 am, Ross Finlayson wrote:   
   > >>>>> On 02/23/2026 08:46 AM, Ross Finlayson wrote:   
   > >>>>>> On 02/23/2026 03:28 AM, J. J. Lodder wrote:   
   > >>>>>>> Ross Finlayson  wrote:   
   > >>>>>>>   
   > >>>>>>>> On 02/22/2026 07:42 AM, Bill Sloman wrote:   
   > >>>>>>>>> On 22/02/2026 10:24 pm, Ross Finlayson wrote:   
   > >>>>>>>>>> On 02/22/2026 03:11 AM, Ross Finlayson wrote:   
   > >>>>>>>>>>> On 02/22/2026 01:20 AM, Bill Sloman wrote:   
   > >>>>>>>>>>>> On 22/02/2026 6:18 pm, Ross Finlayson wrote:   
   > >>>>>>>>>>>>> On 02/21/2026 08:27 PM, Bill Sloman wrote:   
   > >>>>>>>>>>>>>> On 22/02/2026 12:06 am, Ross Finlayson wrote:   
   > >>>>>>>>>>>>>>> On 02/21/2026 04:23 AM, Bill Sloman wrote:   
   > >>>>>>>>>>>>>>>> On 21/02/2026 4:31 pm, Ross Finlayson wrote:   
   > >>>>>>>>>>>>>>>>> On 02/20/2026 08:39 PM, Bill Sloman wrote:   
   > >>>>>>>>>>>>>>>>>> On 21/02/2026 3:46 am, john larkin wrote:   
   > >>>>>>>>>>>>>>>>>>> On Fri, 20 Feb 2026 18:32:18 +1100, Bill Sloman   
   > >>>>>>>>>>>>>>>>>>>    
   > >>>>>>>>>>>>>>>>>>> wrote:   
   > >>>>>>>>>>>>>>>>>>>> On 20/02/2026 3:54 am, john larkin wrote:   
   > >>>>>>>>>>>>>>>>>>>>> On Thu, 19 Feb 2026 14:13:06 +0100,   
   > >>>>>>>>>>>>>>>>>>>>> nospam@de-ster.demon.nl   
   > >>>>>>>>>>>>>>>>>>>>> (J. J.   
   > >>>>>>>>>>>>>>>>>>>>> Lodder) wrote:   
   > >>>>>>>>>>>>>>>>>>>>>> Bill Sloman  wrote:   
   > >>>>>>>>>>>>>>>>>>>>>>> On 19/02/2026 9:56 pm, J. J. Lodder wrote:   
   > >>>>>>>>>>>>>>>>>>>>>>>> Bill Sloman  wrote:   
   > >>>>>>>>>>>>>>>>>>>>>>>>> On 19/02/2026 7:49 am, Ross Finlayson wrote:   
   > >>>>>>>>>>>>>>>>>>>>>>>>>> On 02/18/2026 12:43 PM, Python wrote:   
   > >>>>>>>>>>>>>>>>>>>>>>>>>>> Le 18/02/2026 à 20:13, Ross Finlayson a écrit :   
   > >>>>   
   > >>>>    
   > >>>>   
   > >>>>>> NIST PDG CODATA posts updated values of physical constants   
   > >>>>>> every few years, that over time have gotten smaller besides   
   > >>>>>> more precise: what kind of science are they doing that   
   > >>>>>> that is your entire world-view.   
   > >>>>>>   
   > >>>>>>   
   > >>>>>> So, it "is" an analysis of the coordinates and origin and   
   > >>>>>> identity and dimensions about the mathematical and physical   
   > >>>>>> constants of the running constants or "change". It "is"   
   > >>>>>> a gauge theory. It "is" a continuum mechanics.   
   > >>>>>>   
   > >>>>>> It "is" a bit more than 11'th graders' linear algebra,   
   > >>>>>> and Buckingham-Pi "dimensionless" analysis.   
   > >>>>>>   
   > >>>>>> Heh. At least first it's a true theory with the   
   > >>>>>> universe of mathematical objects in it.   
   > >>>>>   
   > >>>>> What, you thought Boltzmann constant was a   
   > >>>>> purely physical constant?   
   > >>>>>   
   > >>>>> https://en.wikipedia.org/wiki/Boltzmann_constant   
   > >>>>   
   > >>>> Most people who know anything about physics have that idea.   
   > >>>   
   > >>> Real physicists understand what are real physical constants,   
   > >>> like \alpha for example, and which constants are meaningless, like c,   
   > >>> because they you tell one about what units you are using.   
   > >>   
   > >> The exact numerical value of c has mattered to me from time to time.   
   > >   
   > > Good for you that c has an exact numerical value, these days.   
   > >   
   > >> Being human, I have to measure things in units, and transform that   
   > >> measured distance into a propagation delay.   
   > >   
   > > There is nothing but a propagation delay.   
   >   
   > But I couldn't measure that all that accurately, and I need at least a   
   > rough value for the propagation delay before I could build the hardware   
   > on which I could have measured the propagation delay.   
      
   That's part of being a competent experimenter.   
      
   > > Length is by definition measured in (nano)seconds.   
   > > Anyone who thinks different is fooling himself.   
   >   
   > You may have a preference for expressing it in nanoseconds, but   
   > machinists prefer millimeters. I found it politic to keep them happy.   
      
   In case of trouble you may remind those machinists   
   that a measurement isn't a measurement   
   unless it can be traced to a primary standard.   
      
   > At least one engineer I knew complained that he was nothing but a   
   > walking table of conversion factors. Life would be easier if that was   
   > the whole job.   
      
   True, for Americans.   
   It becomes a problem when you need more than slide rule accuracy,   
      
   Jan   
   (still have an inherited one with a lots factors printed on the back)   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)