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  1. Enigma, German Cipher Machine Created Codes For Sending Messages During WWII
  2. Telecommunication Towers near Bulls Head, Dingle Peninsula, County Kerry, Ireland
  3. Fiber optic cable
  4. Recording thumbprint
  5. Blood centrifuge
  6. Genome sequencing machine
  7. Man and Machine
  8. Light bulb, historical artwork
  9. Light bulb
  10. Garnerin's parachute design, 1797
  11. Palmtop
  12. Parkes radio telescope at night, Parkes, NSW, Australia.
  13. An early telephone
  14. Telecommunication Towers near Bulls Head, Dingle Peninsula, County Kerry, Ireland
  15. Vieques, Puerto Rico, A laptop is sitting in the middle of an unmade hotel bed
  16. Hornblower's engine
  17. Computer graphic line graph, full frame
  18. Cut-away artwork of a windmill for grinding corn
  19. Refractor telescope, 1928
  20. Hydraulics Explained
  21. Chit Chat
  22. Chain and lock on laptop computer
  23. 19th-century mining machine
  24. Solar cell
  25. Oscilloscope trace
  26. German printing press inventors
  27. Television studio engineer gets several views of the image
  28. Actress Norma Shearer inspects a sound proof camera
  29. Boring a hole
  30. Grain Mills
  31. Solar park, Ciudad Real, Spain
  32. United States, Satellite Dish
  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. Diamond-tipped drill, 19th century
  38. Lamps connected in series
  39. Lamps connected in parallel
  40. Early escalator, 1894
  41. Various diodes