07-30-2021, 11:50 PM
I'm still amazed by OG telephones. Coast-to-coast voice communication in the age of horse and buggy, 20 years before the first electronic device was invented.
The signaling system alone is an amazing achievement for the 19th century. Rapidly disconnecting and reconnecting the circuit to send the digits in the phone number. Sending 20Hz 90V AC electrical current to ring the bell. Using spinning electrical generators to send the call progress tones (dial tone, busy signal, ringing, etc.)
The signaling system alone is an amazing achievement for the 19th century. Rapidly disconnecting and reconnecting the circuit to send the digits in the phone number. Sending 20Hz 90V AC electrical current to ring the bell. Using spinning electrical generators to send the call progress tones (dial tone, busy signal, ringing, etc.)
