26 Sep
2004
26 Sep
'04
2:40 a.m.
Tony Duell wrote:
Yes, but I can't remember which end you put the slug at for which action
And slugged
relays, with a big metal ring in the coil. These either
delay opening or closing, but I can't remember which way round it works.
I believe (without running upstairs to look in 'Telephony' [1]) that you
can arrange for either a slow make or a slow release [1] A great 2-volume set on the UK telephone system,
mine is the 1933
edition IIRC. They contain _complete_ schematics for telephone exchanges
(Well, OK, the circuit for each line is drawn once, not <n> times, but
you know what I mean). They were the books that finally let me understand
how telephgone exchanges work, and proved to me the dangers of giving a
simplified explanation (in that I'd read plenty of simplified books on
how telephone systems work and couldn't make any sense of them).
Now, somewhere I have a very old book on telephony and telegraphy that
sounds very similar to that. At least, I hope I still have - after my
father went silent-key around 10 years ago, it seems that a few people
had some novel ideas about what belonged to them (his Bob Dylan lp
collection is long gone, for one thing). It had diagrams of the various
sections of the exchange, slightly simplified, and then another diagram
detailing how they go together (line finders, call routing, stuff like
that).
Gordon.