Calcolatoria by Nicola Marras

Calcolatoria is Nicola Marras's personal website documenting the history of calculating instruments, from slide rules and mechanical calculators to early electronic calculators, including a free e-book and materials from his interactive exhibitions held internationally. It covers the history of both analog tools (slide rules) and digital mechanical calculators, and also touches on the history of communications and pre-GPS navigation. The site includes exhibition photos, historical posters, and a virtual slide rule.