1. David Bushnell   Submarine   Air Pump   Internal Combustion Engine   Electric Furnace   Hint Half-n-half Clue   2. Dr. Wallace H. Carothers   Arc Lamp   Transistor   Nylon   Electric Flat Iron   Half-n-half Clue   3. Alessandro Volta   Hovercraft   Electric Motor (AC)   Power Loom   Electric Battery   Half-n-half Clue   4. Leo H Baekeland   Carburettor   Submarine   Ball-Point Pen   Bakelite   Half-n-half Clue   5. Andre-Marie Ampere   Bicycle   Galvanometer   Printing Press   Refrigerator   Half-n-half Clue   6. H. W. Seeley   Electric Flat Iron   Power Loom   Arc Lamp   Logarithmic Tables   Half-n-half Clue   7. Sir Frank Whittle   Logarithmic Tables   Electric Flat Iron   Submarine   Jet Engine   Half-n-half Clue