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  1. Worker examining empty airplane
  2. Chain and lock on laptop computer
  3. Actress Norma Shearer inspects a sound proof camera
  4. United States, California, Owens Valley Radio Observatory (OVRO), Radio Telescope
  5. Solar cell
  6. Measuring electric current
  7. Hydraulics Explained
  8. 19th-century mining machine
  9. German printing press inventors
  10. Solar park, Ciudad Real, Spain
  11. Early escalator, 1894
  12. Television studio engineer gets several views of the image
  13. Pumping engines, 19th century
  14. Compass
  15. ITER fusion research reactor
  16. Fiber optic cable
  17. Engraving of the Bullock Rotary Press of 1865
  18. Eighteenth Century Illustration Of A New Machine To Go Without Horses
  19. Multicoloured Light Trails
  20. Lamps connected in series
  21. Concentrating Solar Power Plant
  22. Diamond-tipped drill, 19th century
  23. Colliding beam fusion reactor
  24. Multicoloured Light Trails
  25. Lamps connected in parallel
  26. Grey Telephone
  27. Blue Telephone,