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From: David Wade <g4ugm@dave.invalid>
Newsgroups: comp.misc,alt.folklore.computers
Subject: Re: the early teletype
Date: Fri, 15 Nov 2024 12:03:04 +0000
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On 15/11/2024 01:48, Lawrence D'Oliveiro wrote:
> On Fri, 15 Nov 2024 00:34:06 +0000, David Wade wrote:
> 
>> You used a tuning fork with a thin "slit" attached to each leg. The
>> slits were arranged so they opened and closed as the fork vibrated
>> creating a tuned shutter.
> 
> Ah, of course. The “Bulova Accutron” method of accurate timing
> calibration, before the technique was obsoleted by cheap quartz crystal
> oscillators. ;)

Yes, I own a couple of Accutrons. Always interesting. These days I use a 
digital tacho thing that refelects off a reflective stick on strip to 
time my TTYs

Dave