1. Stethoscope   Dr. William Stokes, Rene Laennec   James Harrison, Alexander Catlin   Gottlieb Daimler   H. W. Seeley   Hint Half-n-half Clue   2. Electric Motor (AC)   Z. Janssen   Kirkpatrick Macmillan   Christopher Cockerell   Nikola Tesla   Half-n-half Clue   3. Vaccination   Edward Jenner   Sir Isaac Pitman   Kirkpatrick Macmillan   Otto   Half-n-half Clue   4. Barometer   William Siemens   H. W. Seeley   Evangelista Torricelli   C. F. Brush   Half-n-half Clue   5. Laboratory Gas Burner   Otto   Sir Isaac Pitman   Karl Benz   Robert Wilhelm Von Bunsen   Half-n-half Clue   6. Fountain Pen   Dr. Alan M. Turing   Otto von Guericke   Lewis E. Waterman   Evangelista Torricelli   Half-n-half Clue   7. Carburettor   David Bushnell   Otto   Gottlieb Daimler   Edward Jenner   Half-n-half Clue