1. Microscope   Z. Janssen   Dr. Wallace H. Carothers   Sir Frank Whittle   Sir Isaac Pitman   Hint Half-n-half Clue   2. Automobiles using gasoline   Christopher Cockerell   Z. Janssen   Karl Benz   David Bushnell   Half-n-half Clue   3. Fountain Pen   Lewis E. Waterman   William Siemens   Christopher Cockerell   David Bushnell   Half-n-half Clue   4. Electric Battery   Evangelista Torricelli   Alessandro Volta   Roger Bacon   John J. Loud   Half-n-half Clue   5. Logarithmic Tables   Karl Benz   Dr. Wallace H. Carothers   Otto von Guericke   John Napier   Half-n-half Clue   6. Electric Flat Iron   William Siemens   H. W. Seeley   Christopher Cockerell   Alessandro Volta   Half-n-half Clue   7. Carburettor   Robert Wilhelm Von Bunsen   William Siemens   Gottlieb Daimler   Leo H Baekeland   Half-n-half Clue