XPost: alt.folklore.computers   
   From: snipeco.2@gmail.com   
      
   Sn!pe  wrote:   
      
   > Lawrence D'Oliveiro  wrote:   
   >   
   > > On Thu, 14 Nov 2024 22:19:48 +0000, Sn!pe wrote:   
   > >   
   > > > Lawrence D'Oliveiro  wrote:   
   > > >   
   > > >> On Thu, 14 Nov 2024 18:45:48 GMT, Charlie Gibbs wrote:   
   > > >>   
   > > >> > Original Teletype machines ran at 45.45 baud.   
   > > >>   
   > > >> I remember labels on Creed machines saying "50Bd".   
   > > >   
   > > > I had a Creed 7B 60 years ago, I used it for RTTY.  It had two   
   > > > governers, one for 45.45 Bd, the other for 50Bd.  They had white   
   > > > strobe marks on the circumference to set the speed accurately.   
   > >   
   > > Hmmm ... presumably the strobe marks were for use with a fluorescent   
   > > light ... driven from AC mains frequency? Did they have different marks   
   > > for 50Hz versus 60Hz mains?   
   > >   
   > > No, that wouldn't work, you would need entirely different gearing for the   
   > > strobe wheel ...   
   >   
   > IIRC 50Bd was the US standard, most common in the rest of the world   
   > was 45.45Bd  There was no gearing involved, the governor was attached   
   > directly to the motor spindle and the strobe timing marks were on the   
   > governors themselves.  I think (I'm not sure) that there were a   
   > different number of strobe marks on either governor.   
   >   
   > I speak from personal experience but it was 60 years ago when I was   
   > a teenager and memory is a tricky thing.   
      
   P. S.  Pics. here, note the governor on the left.  I think that must be   
   the dual speed version; I had two separate governors which had to   
   be interchanged:   
      
      
      
   --   
   >^Ï^.    Sn!pe, PTB, FIBS        My pet rock Gordon just is.   
      
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