| Answer | Crossword Clue |
|---|---|
| DIESEL | 19th C. engine engineer |
| EADS | 19th cen. American engineer. |
| MACADAM | Early 19th-century invention named after a Scottish engineer |
| EADS | 19th-century engineer with a star on the St. Louis Walk of Fame |
| steamboats | A boat that is propelled by a steam engine, esp. a paddle-wheel craft of a type used widely on rivers in the 19th century |
