Requires Tier 7 — Electricity. Electricity becomes useful when it can carry information over distance. This tier covers the technologies that let a rebuilding society coordinate beyond line-of-sight.
Articles
-
Telegraph — Morse code, wire communication
-
Radio — electromagnetic waves, transmitters, and receivers
-
Telephony — microphones, speakers, signal transmission
-
Vacuum Tubes — amplification, the first active electronic component
-
Photography — cameras, silver halide chemistry, darkroom processing