1. Refrigerator   James Harrison, Alexander Catlin   Edmund Cartwright   Z. Janssen   Louis Pasteur   Hint Half-n-half Clue   2. Airship (rigid)   Sir Isaac Pitman   G. Ferdinand Von Zeppelin   Bardeen, Shockley, Brattain   Louis Pasteur   Half-n-half Clue   3. Laboratory Gas Burner   Sir Isaac Pitman   Kirkpatrick Macmillan   Evangelista Torricelli   Robert Wilhelm Von Bunsen   Half-n-half Clue   4. Submarine   G. Ferdinand Von Zeppelin   Edmund Cartwright   James Harrison, Alexander Catlin   David Bushnell   Half-n-half Clue   5. Shorthand   John Napier   Sir Frank Whittle   Gottlieb Daimler   Sir Isaac Pitman   Half-n-half Clue   6. Bakelite   Edmund Cartwright   Leo H Baekeland   Otto   Louis Pasteur   Half-n-half Clue   7. Automobiles using gasoline   G. Ferdinand Von Zeppelin   Lewis E. Waterman   Karl Benz   Robert Wilhelm Von Bunsen   Half-n-half Clue