1. Sir Isaac Pitman   Laboratory Gas Burner   Galvanometer   Shorthand   Hovercraft   Hint Half-n-half Clue   2. Kirkpatrick Macmillan   Bicycle   Internal Combustion Engine   Laboratory Gas Burner   Automobiles using gasoline   Half-n-half Clue   3. Edward Jenner   Carburettor   Fountain Pen   Vaccination   Electric Motor (AC)   Half-n-half Clue   4. Bardeen, Shockley, Brattain   Transistor   Automobiles using gasoline   Shorthand   Fountain Pen   Half-n-half Clue   5. Roger Bacon   Power Loom   Logarithmic Tables   Fountain Pen   Gunpowder   Half-n-half Clue   6. John J. Loud   Fountain Pen   Galvanometer   Ball-Point Pen   Gunpowder   Half-n-half Clue   7. Johann Gutenberg   Bicycle   Jet Engine   Printing Press   Internal Combustion Engine   Half-n-half Clue