1. Fountain Pen   Nikola Tesla   Sir Isaac Pitman   Dr. William Stokes, Rene Laennec   Lewis E. Waterman   Hint Half-n-half Clue   2. Laboratory Gas Burner   Robert Wilhelm Von Bunsen   H. W. Seeley   Edmund Cartwright   Edward Jenner   Half-n-half Clue   3. Logarithmic Tables   Gottlieb Daimler   Z. Janssen   John J. Loud   John Napier   Half-n-half Clue   4. Internal Combustion Engine   Alessandro Volta   Otto   Kirkpatrick Macmillan   Evangelista Torricelli   Half-n-half Clue   5. Microscope   Nikola Tesla   Lewis E. Waterman   Dr. William Stokes, Rene Laennec   Z. Janssen   Half-n-half Clue   6. Automobiles using gasoline   Karl Benz   David Bushnell   Edmund Cartwright   John J. Loud   Half-n-half Clue   7. Carburettor   Otto   Gottlieb Daimler   H. W. Seeley   Johann Gutenberg   Half-n-half Clue