| Answer | Crossword Clue |
|---|---|
| NAPIER | Logarithm inventor John |
| LARSON | Polygraph inventor John |
| DEERE | Plow inventor John |
| FITCH | Passenger steamboat inventor John |
| MCADAM | Scottish inventor and road builder John Loudon ... |
| BAIRD | John Logie .., inventor of the first mechanical TV |
