What electrical telegraph is made of
Sending messages as electrical signals over wires (Schilling, Cooke and Wheatstone, Morse).
- Copper wire — has part. Communication lines.
- Electromagnet — has part. Morse’s receiver.
- Relay — has part. Relays boosted the signal on long lines.
- Electromagnetism — uses. A telegraph receiver is an electromagnet that attracts an armature.
- Morse code — uses. Morse encoding.
- Copper — is made of. The wires are copper and iron.