Watt worked as a mathematical-instrument maker from the age of 19. 1 Did Watt work as a mathematical-instrument maker? 2 Who worked as a mathematical-instrument maker from the age of 19? 3 Did Watt work as a mathematical-instrument maker from the age of 19 or 21? 4 Watt worked as a mathematical-instrument maker, didn't he? 5 From what age did Watt work as a mathematical-instrument maker?
1 Did Watt work as a mathematical-instrument maker?
2 Who worked as a mathematical-instrument maker from the age of 19?
3 Did Watt work as a mathematical-instrument maker from the age of 19 or 21?
4 Watt worked as a mathematical-instrument maker, didn't he?
5 From what age did Watt work as a mathematical-instrument maker?