4 ms·

I'm a bit curious about something that I've never thought about before -- how were telegraph signals routed? Was it just a one way street, or did they have a fr

• cableguy 5y ago
  This was long before there were any electronic devices to amplify or otherwise manipulate the signal. The telegraph signals were just short electrical pulses representing Morse code, with a positive voltage for a dot and a negative voltage for a dash. The lines could only be worked in one direction at a time for many years, but eventually circuits were used at each end to "duplex" the cable, allowing messages to be sent in both directions at the same tim.