Obscure Inventions

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Across
  1. 5. – Rigid airship used in early aviation
  2. 7. – Camera stabilized by gimbal mechanism
  3. 9. – Device for underwater breathing
  4. 10. – Early electronic component
Down
  1. 1. – Boat designed to skim across water
  2. 2. – Mask used during plague outbreaks
  3. 3. – System for transporting items in tubes
  4. 4. – 18th-century chess-playing automaton
  5. 6. – Navigational instrument for measuring angles
  6. 8. – Ancient instrument for astronomical measurements