Ah, Marconi. Here's a little piece of local Marconi history.
<http://www.everythingradio.com/Marconi%20Tower.htm>
Somewhere I have a much better photo but it's not on my site.
Chuck Norcutt
On 10/26/2010 4:31 PM, Jez Cunningham wrote:
> As an apprentice (while doing a year in industry before going to
> university - a so-called thick-sandwich course - one of my assignments
> was in the inspection team in a metalworking section. This was 1970/1
> and the company (Marconi) had recently switched to 'unified' threads.
> All our equipment racks (for Royal Navy radio gear) had warning labels
> attached "Some threads are unified" (which we sang to the tune of La
> Donna e Mobile from Rigoletto).
>
> Up to that time a huge mixture of threads had been used and moving to
> UNC/UNF was a great simplification. Of course moving to metric
> sometime later was even 'better'.
>
> As I recall, there is a one-way compatibility between some sizes - but
> it was what we called a 'rattling good fit'. The other way was ok for
> a few turns but could bind. All down to the thread angles...
--
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