The invention of the phone

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Across
  1. 2. The scientific study of sound, which helped Bell develop the telephone.
  2. 5. Alexander Graham Bell's most famous invention.
  3. 8. The telephone revolutionized this aspect of human interaction.
  4. 10. Adjective that describes the significance of Bell's invention.
  5. 11. Legal document granted to Bell for his invention.
  6. 12. Device used by telephone operators to connect calls.
  7. 14. The first name of the inventor of the telephone.
  8. 15. Part of the telephone that converts electrical signals into sound.
Down
  1. 1. The primary use of the telephone.
  2. 3. Communication technology that preceded the telephone.
  3. 4. Last name of the inventor of the telephone.
  4. 6. Part of the telephone that converts sound into electrical signals.
  5. 7. The telephone made it possible to transmit this over long distances.
  6. 9. The invention of the telephone was a major one.
  7. 13. Person who used to connect calls manually.