From: liz@poppyrecords.invalid.invalid   
      
   John R Walliker  wrote:   
      
   > On 10/12/2025 23:06, Don Y wrote:   
   > > On 12/10/2025 7:25 AM, Liz Tuddenham wrote:   
   > >> Martin Brown <'''newspam'''@nonad.co.uk> wrote:   
   > >>   
   > >> [...]   
   > >>>   
   > >>> ISTR that in the Three Mile Island disaster they spent the first fifteen   
   > >>> minutes of the emergency trying to silence all the different damn alarms   
   > >>> that made it impossible to think in the control room. Only once they had   
   > >>> the noise under control could they communicate with each other across   
   > >>> the room.   
   > >>   
   > >> I worked in a university where they had just one sounder for each floor,   
   > >> mounted at the end of a each corridor.  They had made it loud enough to   
   > >> be heard in the laboratories with all the doors shut.  It would have   
   > >> been safer to climb out of a window than enter the corridor and try to   
   > >> escape past the sounder.   
   > >   
   > > You can get 200-300dB klaxon's relatively easily.  I had one in   
   > > college that was "fun" (for some perverse definition of "fun")   
   > > to play with.   
   >   
   > Are you sure about that?  200dB is a couple of atmospheres.   
      
   Does this mean that the pressure during the negative half-cycles goes   
   below a perfect vacuum or that the device doubles the average   
   atmospheric pressure in its vicinity?   
      
      
      
   --   
   ~ Liz Tuddenham ~   
   (Remove the ".invalid"s and add ".co.uk" to reply)   
   www.poppyrecords.co.uk   
      
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