1. John Napier   Automobiles using gasoline   Rabies Vaccine   Barometer   Logarithmic Tables   Hint Half-n-half Clue   2. Evangelista Torricelli   Barometer   Shorthand   Refrigerator   Gunpowder   Half-n-half Clue   3. Z. Janssen   Microscope   Carburettor   Jet Engine   Airship (rigid)   Half-n-half Clue   4. Edmund Cartwright   Power Loom   Stethoscope   Logarithmic Tables   Refrigerator   Half-n-half Clue   5. Dr. Alan M. Turing   Internal Combustion Engine   Carburettor   Electronic Computer   Gunpowder   Half-n-half Clue   6. Johann Gutenberg   Printing Press   Bakelite   Shorthand   Submarine   Half-n-half Clue   7. Lewis E. Waterman   Fountain Pen   Power Loom   Electronic Computer   Stethoscope   Half-n-half Clue