Who developed a mechanical device in the 17th century that could add, subtract, multiply, divide and find square roots?

Who developed a mechanical device in the 17th century that could ad

1.	Who developed a mechanical device in the 17th century that could add, subtract, multiply, divide and find square roots?
A.	Pascal
B.	Napier
C.	Leibnitz
D.	Babbage
Answer» D. Babbage