XPost: alt.usage.english   
   From: nospam@de-ster.demon.nl   
      
   Peter Moylan  wrote:   
      
   > On 23/09/24 01:50, J. J. Lodder wrote:   
   > > Peter Moylan  wrote:   
   >   
   > >> The one non-metric measurement that I find useful is "one foot per   
   > >> nanosecond".   
   > >   
   > > Impossible to go that fast,   
   >   
   > Useful, though, to get an estimate of the time delays across the width   
   > of a printed circuit board.   
   >   
   > I'm not actually involved in high-speed electronics, but I think the   
   > current rule of thumb is that the speed of signals on a printed circuit   
   > board is about two-thirds of the speed in a vacuum.   
      
   Metric still beats you: 30 cm/nanosecond is more accurate.   
   BTW, just to annoy the dimension fundies, (if any)   
   it is nowadays quite correct to say that a nanosecond equals a foot,   
   (or 30 cm) almost,   
      
   Jan   
      
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