1. Barometer   Dr. Wallace H. Carothers   Evangelista Torricelli   Andre-Marie Ampere   Edward Jenner   Hint Half-n-half Clue   2. Jet Engine   David Bushnell   Z. Janssen   Dr. Wallace H. Carothers   Sir Frank Whittle   Half-n-half Clue   3. Airship (rigid)   Dr. Wallace H. Carothers   Dr. Alan M. Turing   Z. Janssen   G. Ferdinand Von Zeppelin   Half-n-half Clue   4. Hovercraft   Otto   Christopher Cockerell   Johann Gutenberg   Alessandro Volta   Half-n-half Clue   5. Arc Lamp   William Siemens   Edward Jenner   Robert Wilhelm Von Bunsen   C. F. Brush   Half-n-half Clue   6. Stethoscope   Dr. William Stokes, Rene Laennec   Z. Janssen   Andre-Marie Ampere   Karl Benz   Half-n-half Clue   7. Galvanometer   Andre-Marie Ampere   Alessandro Volta   Gottlieb Daimler   Sir Isaac Pitman   Half-n-half Clue