Famous Inventions and Inventors #9

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Across
  1. 5. (Steam engine)
  2. 6. (Assembly line)
  3. 7. (Telephone)
  4. 10. (Radio)
  5. 11. (Alternating current)
  6. 12. (Dynamite)
  7. 14. (Printing press)
  8. 15. (Telegraph)
Down
  1. 1. (Airplane)
  2. 2. (Electricity experiments)
  3. 3. (Analytical engine)
  4. 4. (Water screw)
  5. 8. (Computer)
  6. 9. (Vaccination)
  7. 13. (Electric light bulb)