Across
- 3. Samuel Morse's partner in developing Morse code
- 5. the part of the telegraph used to receive and record incoming messages
- 7. a universal distress signal
- 8. the part of the telegraph that provides the electric current
- 9. an alphabet with letters that are represented by long and short signals of sound or light
Down
- 1. the first company to provide mail service in the United States
- 2. a magnet with a metal core that is magnetized by an electric current running through a coil that surrounds it
- 4. sea-related code originated in Morse code
- 6. the part of the telegraph used to transmit outgoing messages