Log Tables

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

Logarithms and log tables - what Professor Bowley used before calculators!
More on this: http://youtu.be/vzV50goW_WM

Professor Roger Bowley is an emeritus professor at the University of Nottingham.