Thylacine - I have a deep respect for the cleverness of modern electronics but I agree that unless you can see the component unaided and solder it or screw it to something else then it kinda loses me. The circuit/wiring diagram I attached had it's own "feel" too, I guess from the unusual typeface/font. The ones in the Journal and books of the time, if my memory serves, had their own characteristic look which I am eager to see again.
Dave89 - It would be great if you could scan one of the diagrams and share it here also. Then maybe we can do a comparison between Herbert/Proctor and Atkinson. I noticed that eBay and similar have single volumes going for £60!
Similarly I am sure the old PO Journals must have replicated some of these more simpler diagrams, so if anyone has a copy please do post.
Bren - "Dolls-eye" indicators - brilliant. I assume that is your good self acting as the good operator at
https://penroom.co.uk There is a useful and entertainingly written overview of this type of board at
https://www.johnhearfield.com/Telephone/CBS2.htm with some diagrams of the dolls-eye relays and Circuit diagrams
after Telephony (Vol 1), Herbert & Proctor (1932) - be nice to compare with scan of originals.
I like the line at the end "The operator clears the call by unplugging the cord, and goes back to day-dreaming about the handsome young technician who keeps coming round to dust the relays ..." My excuses centred around fixing her rolling dolls-eyes or changing her cords - don't think those lines would work now.....