Comment Comment by chriscool The article on Wikipedia, https://en.wikipedia.org/wiki/Pascal%27s_calculator, looks like a much better link to me.The following other mechanical calculator also seems to be an important step: https://en.wikipedia.org/wiki/Arithmometer parent chriscool 9 years ago
The following other mechanical calculator also seems to be an important step: https://en.wikipedia.org/wiki/Arithmometer