1. Vaccination   Edward Jenner   Roger Bacon   John J. Loud   Sir Isaac Pitman   Hint Half-n-half Clue   2. Ball-Point Pen   Sir Isaac Pitman   Alessandro Volta   Z. Janssen   John J. Loud   Half-n-half Clue   3. Nylon   John Napier   Dr. Alan M. Turing   Sir Isaac Pitman   Dr. Wallace H. Carothers   Half-n-half Clue   4. Airship (rigid)   Sir Frank Whittle   H. W. Seeley   G. Ferdinand Von Zeppelin   Dr. William Stokes, Rene Laennec   Half-n-half Clue   5. Air Pump   James Harrison, Alexander Catlin   Bardeen, Shockley, Brattain   C. F. Brush   Otto von Guericke   Half-n-half Clue   6. Carburettor   C. F. Brush   Karl Benz   Evangelista Torricelli   Gottlieb Daimler   Half-n-half Clue   7. Internal Combustion Engine   Sir Isaac Pitman   Bardeen, Shockley, Brattain   Otto   Robert Wilhelm Von Bunsen   Half-n-half Clue