What was the strange thing that inventor noticed as they were trying to improve the telegraph?
1. Sounds only went through when the wires were connected.
2. Sounds were going to other things besides wire.
3. Signals were picked up by wires that were far apart.
4. Signals were going through the air to other wires.
Answers: 3
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What was the strange thing that inventor noticed as they were trying to improve the telegraph?
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