Empire of the Sum
Todays blog post are a few scans from a book I read recently title Empire of the Sum: The Rise and Reign of the Pocket Calculater
Table of contents
Introduction page for Empire of the Sum
Introduction for Empire of the Sum
The Lebombo Bone
A Bulla
Gallery of Roman Tesserae
Illustration Guide to Bede’s finger counting method
Abacus use explanation
Abacus use explanation
Earliest known abacus aka counting board
Chinese counting rod numerals
Earliest known Chinese Abacus
Mordern replica of classical Roman Hand Abacus