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 add,

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