Dennis Plunkett wrote:

> The loop to ground indicates that Paul was connected to a manual
> exchage where a wink would be recevied, so Duplexor and privacy?

  Nope, gotcha there!  It was an automatic exchange.  There were
actually two types of relay set (called "Relay set, Duplex, type...") of
which one required the pushbutton and one did not.  I know, because
years later I studied (and IIRC, photocopied) the manuals for them in
the Tech library.

  The wiring in the exchange was dead easy, just two normal subscriber
line sets with some connections wired funny.  Each connected the loop
(was it "L") relay to one of the line wires, when this relay pulled in,
both line wires went through that particular set and the other was
busied.

  Absolutely nothing to do with manual exchanges.
--
  Cheers,
        Paul B.