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"The following pages contain a scholarly and easily-readable investigation of very early recording media that was used during the early days of radio." And a list of all the known-to-exist recordings (mostly American).
to audio history radio recording retrotech ... on 14 December 2013
Recovering recordings of early (i.e. 1920s) British TV.
to broadcast history recording restoration retrotech tv ... on 01 December 2013
I got here via the comprehensive section on American early broadcast radio (while looking to see which of the Mercury Theatre's radio productions survive -- turns out many of them do and they're pretty good). The maths stuff here is at least as interesting, though.
to broadcasting history maths radio retrotech stamps ... on 01 December 2013
The library here is good, if a bit hard to navigate.
to history retrotech telecom telephone ... on 01 December 2013
A History of Engineering and Science in the Bell System Switching Technology (1925-1975)
Extensive history of automatic exchanges in the Bell System. Lots of other US telecoms history documentation here too.
to exchange history retrotech telecom telephone ... on 01 December 2013
British telecoms history -- e.g. how area codes relate to placenames, and the early history of automatic exchanges.
to history phone retrotech telecom telephone uk ... on 01 December 2013
Andy Emmerson's site -- telephone and telecomms history, particularly for the UK.
to history retrotech telecom telephone ... on 13 November 2013
"A teletext inserter add-on for Raspberry Pi."
to electronics raspberry-pi retrotech teletext video ... on 12 November 2013
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tasty by Adam Sampson.