1. Carburettor   Christopher Cockerell   Kirkpatrick Macmillan   Gottlieb Daimler   James Harrison, Alexander Catlin   Hint Half-n-half Clue   2. Stethoscope   Nikola Tesla   Dr. William Stokes, Rene Laennec   Edmund Cartwright   John J. Loud   Half-n-half Clue   3. Submarine   Dr. Wallace H. Carothers   David Bushnell   John J. Loud   Gottlieb Daimler   Half-n-half Clue   4. Airship (rigid)   Edmund Cartwright   G. Ferdinand Von Zeppelin   John Napier   John J. Loud   Half-n-half Clue   5. Automobiles using gasoline   Dr. William Stokes, Rene Laennec   Sir Frank Whittle   Bardeen, Shockley, Brattain   Karl Benz   Half-n-half Clue   6. Electronic Computer   Johann Gutenberg   Christopher Cockerell   John J. Loud   Dr. Alan M. Turing   Half-n-half Clue   7. Fountain Pen   Dr. Wallace H. Carothers   Dr. Alan M. Turing   Kirkpatrick Macmillan   Lewis E. Waterman   Half-n-half Clue