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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.misc,alt.folklore.computers
Subject: Re: the early teletype
Date: Fri, 15 Nov 2024 01:48:56 -0000 (UTC)
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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. ;)