1. Lightning Conductor   John Boyd Dunlop   Michael Faraday   Benjamin Franklin   Rudolf Diesel   Hint Half-n-half Clue   2. Transformer   Michael Faraday   John Logie Baird   Thomas Alva Edison   John Boyd Dunlop   Half-n-half Clue   3. Diesel Engine   Fahrenheit   Rudolf Diesel   Alfred B. Nobel   Elisha G. Otis   Half-n-half Clue   4. Mercury Thermometer   Elisha G. Otis   Fahrenheit   Charles Macintosh   Thomas Alva Edison   Half-n-half Clue   5. Microphone   Sir Alexander Graham Bell   Elisha G. Otis   Thomas Alva Edison   John Boyd Dunlop   Half-n-half Clue   6. Pneumatic Tyres   John Boyd Dunlop   Thomas Alva Edison   Charles Macintosh   Orville and Wilbur Wright   Half-n-half Clue   7. Bifocal Lens   Benjamin Franklin   Charles Goodyear   Thomas Alva Edison   Sir Alexander Graham Bell   Half-n-half Clue