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  1. 19th Century furnace for gas lighting
  2. Napier Lion Engine
  3. Fiber optic cable
  4. Recording thumbprint
  5. Genome sequencing machine
  6. Blood centrifuge
  7. Man and Machine
  8. Light bulb
  9. Light bulb, historical artwork
  10. Refractor telescope, 1928
  11. Garnerin's parachute design, 1797
  12. Palmtop
  13. An early telephone
  14. Parkes radio telescope at night, Parkes, NSW, Australia.
  15. Telecommunication Towers near Bulls Head, Dingle Peninsula, County Kerry, Ireland
  16. Vieques, Puerto Rico, A laptop is sitting in the middle of an unmade hotel bed
  17. Hornblower's engine
  18. Computer graphic line graph, full frame
  19. Cut-away artwork of a windmill for grinding corn
  20. Hydraulics Explained
  21. Chain and lock on laptop computer
  22. Chit Chat
  23. Solar cell
  24. Television studio engineer gets several views of the image
  25. German printing press inventors
  26. Oscilloscope trace
  27. 19th-century mining machine
  28. Actress Norma Shearer inspects a sound proof camera
  29. Boring a hole
  30. Grain Mills
  31. United States, Satellite Dish
  32. Solar park, Ciudad Real, Spain
  33. United States, California, Owens Valley Radio Observatory (OVRO), Radio Telescope
  34. Engraving of the Bullock Rotary Press of 1865
  35. Worker examining empty airplane
  36. Eighteenth Century Illustration Of A New Machine To Go Without Horses
  37. Lamps connected in series
  38. Diamond-tipped drill, 19th century
  39. Early escalator, 1894
  40. Lamps connected in parallel
  41. Various diodes