1. Printing Press   Sir Frank Whittle   Johann Gutenberg   Kirkpatrick Macmillan   Sir Isaac Pitman   Hint Half-n-half Clue   2. Air Pump   G. Ferdinand Von Zeppelin   John Napier   Otto von Guericke   Kirkpatrick Macmillan   Half-n-half Clue   3. Arc Lamp   Alessandro Volta   John J. Loud   C. F. Brush   Nikola Tesla   Half-n-half Clue   4. Nylon   Robert Wilhelm Von Bunsen   Dr. Wallace H. Carothers   Dr. William Stokes, Rene Laennec   Sir Frank Whittle   Half-n-half Clue   5. Hovercraft   Christopher Cockerell   Evangelista Torricelli   Andre-Marie Ampere   Bardeen, Shockley, Brattain   Half-n-half Clue   6. Electric Motor (AC)   Robert Wilhelm Von Bunsen   Alessandro Volta   Evangelista Torricelli   Nikola Tesla   Half-n-half Clue   7. Gunpowder   James Harrison, Alexander Catlin   Sir Isaac Pitman   Roger Bacon   Edmund Cartwright   Half-n-half Clue