John Walker and the Friction Match

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Across
  1. 4. Another word for 'Invention'
  2. 6. The fire-making invention John Walker made in 1826
  3. 7. John's invention made this element when it was struck
  4. 8. John's invention helped people to do this
  5. 9. One of the chemicals John used in his invention
  6. 10. The legal protection John refused to apply to his invention
Down
  1. 1. The town John used to live in
  2. 2. What John's invention was useful for making
  3. 3. Another useful thing John made for both people and animals
  4. 5. The job John trained to be