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From: snipeco.2@gmail.com (Sn!pe)
Newsgroups: comp.misc,alt.folklore.computers
Subject: Re: the early teletype
Date: Mon, 18 Nov 2024 20:00:48 +0000
Organization: Sn!peCo World Wide Wading Birds
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Sn!pe <snipeco.2@gmail.com> wrote:

> Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
> 
> > On Thu, 14 Nov 2024 22:19:48 +0000, Sn!pe wrote:
> > 
> > > Lawrence D'Oliveiro <ldo@nz.invalid> 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:

<https://www.radiomuseum.org/r/creed_teleprinter_7b.html#>

-- 
>^Ï^.    Sn!pe, PTB, FIBS        My pet rock Gordon just is.