[GreenKeys] Teletype (telephone) Local Loops

[Pete G]

If someone else is looking for the "Green Book", looks like Thriftbooks has
a couple for $6.49.
Thriftbooks and Better World Books are great sources for used books. I had
purchased my hardcover copy of the Green Book from BWB for $3.85 including
shipping.

https://www.thriftbooks.com/w/principles-of-electricity-applied-to-telephone-and-telegraph-work/9832216/item/33668388/

Pete
---------- Forwarded message ----------
From: ad7i <ad7i at ad7i.net>
To: Roy Morgan <k1lky68 at gmail.com>
Cc: greenkeys <greenkeys at mailman.qth.net>
Bcc:
Date: Thu, 28 May 2020 22:33:53 -0400
Subject: Re: [GreenKeys] Teletype (telephone) Local Loops
Hi Roy --

I can't thank you enough for recommending the AT&T Green Book.  Amazing
that I was a Bell Head for all of my professional career and never knew
about that book.  I would have loved to have had a copy of that book when I
was 10 years old.  I was a wires and batteries kid, and was very interested
in telephones and clickity-clack telegraph systems at a young age.  I don't
have the physical book in hand yet, but I've enjoyed skimming the PDF that
Jerry Murphy referenced.

When I started at Bell Labs I was working on computer design (really system
design, making a mini computer from an 8086 and a slew of Z80s).
Everything was forward looking, not much interest in the past or history.
But I would occasionally spend time in the records office in the Holmdel
basement looking up and ordering BSPs from long ago detailing info about
telegraph systems and such.  Of course I foolishly didn't keep any of the
copies I pulled after reading them.   I'm sure I could have ordered a copy
of the Green Book then if I had know about it.   The Green Book provides so
much great info.

Thank you so much!

73, Paul, ad7i




On Mon, May 25, 2020 at 12:15 PM Roy Morgan <k1lky68 at gmail.com> wrote:

> Paul,
>
> Especially considering your experience with *real* telephone and teletype
> circuits, may I recommend:
>
> “The Green Book”
> Tu Wit:
> Principles of Electricity
>    applied to
> Telephone and Telegraph Work
>
> The copy I have here is entitled on the tile page:
>
> A Training Course Text
> Prepared for Employees of the
> Long Lines Department
> AMERICAN TELEPHONE AND TELEGRAPH COMPANY
> November 1938
> (Reprinted with corrections, January, 1941)
>
> No teletype library should be without one.
> There we’re a number of editions, the later ones omitted some material
> from the earlier ones I think.
>
> I find one on Amazon ("1941 edition" - could be the 1941 reprint) but
> UNFORTUNATELY, the price is $68.00 !!!  The good news is that there is one
> other one offered for less that $10.  Better scoff it up quick!!
>
> I would not be surprised to find it in  PDF form in one of the very deep
> collections of technical books online.  Can anyone post a link to that
> somewhere?
>
> I, too will be grateful for the experience of others about this topic.  I
> have little experience with local loops, but I do have a couple  of polar
> relays and a Model 28 loop supply (here), and some M-15 equipment (in
> distant storage) that will eventually get assembled into a working setup.
>
> Roy
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