Path: ...!weretis.net!feeder9.news.weretis.net!news.quux.org!eternal-september.org!feeder2.eternal-september.org!news.eternal-september.org!snipe.eternal-september.org!.POSTED!not-for-mail
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
Lines: 42
Message-ID: <1r38hat.5l4jrwnrae5yN%snipeco.2@gmail.com>
References: <673571b4$2$13$882e4bbb@reader.netnews.com> <vh46uj$2mhr0$3@dont-email.me> <wzrZO.4444$pZ%.2037@fx16.iad> <vh5rjb$310hc$2@dont-email.me> <1r319ug.19nvdvtayti13N%snipeco.2@gmail.com> <vh5tka$310hc$8@dont-email.me> <1r31arw.1xrpfjr1favr9hN%snipeco.2@gmail.com>
Reply-To: snipeco.1@gmail.com (Sn!pe)
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: 8bit
Injection-Date: Mon, 18 Nov 2024 21:00:49 +0100 (CET)
Injection-Info: snipe.eternal-september.org; posting-host="95c92ac41c58309c8fd24284fd555929";
	logging-data="1492116"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX19oE8Bo3+cGJQFPfJiOsCFI"
User-Agent: MacSOUP/2.8.6b1 (ed136d9b90) (Mac OS 10.13.6)
Cancel-Lock: sha1:jvWx7pVNrbDLPmTEUbVj+NtlnP0=
X-Validate: All genuine Sn!peCo articles contain the header:
 "Injection-Info: snipe.eternal-september.org;" my registered FQDN.
X-Face: 5<x+vv{"AHN,F~/dhf,X*~1zNv[TF/WUe(Uw.*ZOw\P'Ju]C6].T~7Z5cVjV\xTO6&)1#VQ
 iZ4vFDG
X-Clacks-Overhead: GNU Terry Pratchett; WonK; Large Enid; Lydia Dustbin
X-Disclaimer: Any advice that I may give is worth only what I paid for it.
 This article comprises only my personal opinions unless otherwise stated.
 May contain traces of nuts.
X-Copyright: Copyright (c) 2024 Sn!peCo WWWB, All Rights Reserved.
 This article may be reproduced for the purposes of propagation and
 personal use only, no commercial use without express permission.
X-Tongue-In-Cheek: Always
Bytes: 3684

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#>

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