Discoveries and inventions

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Across
  1. 6. invented crescograph
  2. 7. Father of the computer
  3. 8. Invented the electric bulb
Down
  1. 1. Invented aeroplane
  2. 2. invented zero
  3. 3. missile man of India
  4. 4. Discover gravity
  5. 5. father of the Indian space programme