Assertion: pascal's calculator | /r/HasProperty | mechanical
Facets:
Source sentences:
text: Blaise Pascal continued his mathematical work, inventing a mechanical calculator later called the pascaline at the age of 18.
text: To help his father in laborious tax calculations, in 1642, Blaise Pascal constructed a mechanical calculator capable of performing addition and subtraction directly; and multiplication and division through repeated addition or subtraction.