1. Internal Combustion Engine   Alessandro Volta   Otto   C. F. Brush   John Napier   Hint Half-n-half Clue   2. Electric Battery   Alessandro Volta   Andre-Marie Ampere   Otto   Gottlieb Daimler   Half-n-half Clue   3. Galvanometer   Johann Gutenberg   Leo H Baekeland   John Napier   Andre-Marie Ampere   Half-n-half Clue   4. Bicycle   Johann Gutenberg   H. W. Seeley   Sir Isaac Pitman   Kirkpatrick Macmillan   Half-n-half Clue   5. Laboratory Gas Burner   Sir Frank Whittle   Bardeen, Shockley, Brattain   Dr. Alan M. Turing   Robert Wilhelm Von Bunsen   Half-n-half Clue   6. Electric Flat Iron   David Bushnell   Otto von Guericke   James Harrison, Alexander Catlin   H. W. Seeley   Half-n-half Clue   7. Microscope   Z. Janssen   Lewis E. Waterman   John J. Loud   Roger Bacon   Half-n-half Clue