Across
- 3. Star navigation tool
- 4. Farming tool
- 5. Power source
- 7. Roman architectural element
- 10. Grain grinder
- 11. Shaping tool
- 12. Egyptian paper
- 14. Timekeeping device
- 15. Timekeeping system
- 20. Ceramic tool
- 21. Siege weapon
- 23. Early writing
- 24. Ancient vehicle
- 25. Early transport invention
Down
- 1. Ancient calculator
- 2. Heating source
- 6. Blacksmith tool
- 8. Navigation tool
- 9. Simple machine
- 13. Gutenberg's press
- 16. Water transport
- 17. Roman water channels
- 18. Lifting mechanism
- 19. Early book form
- 22. Metalworking tool