Mathematical tools
Java applet of Chinese, Japanese and Russian abaci tux abacus
Abacus
The World’s Smallest Abacus research ibm atomic
IBM Research | Projects | Atomic and Nano Technology | Engineering with individual molecules at room temperature
Abacus Photos and Images abacus abacus images
★ Abacus Device Images and photos at Abacus.ca Image
Roman abacus
Roman Abacus
Mesoamerican abacus (this site is no longer online - but the webarchive backup is; however, one of the author’s documents comparing the organization and use of the Mesoamerican abacus and the Chinese abacus is mirrored at
A Comparison of Chinese and Mesoamerican Abacuses
Suan Pan
Chinese Abacus
Soroban: The Japanese Abacus Soroban direct from Japan.
Soroban
Soroban Abacus Handbook A guide to addition, subtraction, multiplication and division.
THE ABACUS HANDBOOK
Soroban soroban
first set of words
Lee Kai-chen's Improved Abacus - A demonstration of how the Lee's Abacus works
LEE KAI-CHEN ABACUS - A Demonstration
Advanced Abacus Techniques soroban
Advanced Abacus Techniques - Abacus Instruction. Advanced abacus. Soroban, suan pan techniques.
Abacus: Mystery of the Bead - An Abacus Manual
ABACUS: MYSTERY OF THE BEAD - Abacus Instructions Manual. How to use an abacus. Abacus instruction.
Abacus abacus
The Abacus: Index
Abacus Tutorial Online tutorial teaches addition, subtraction, multiplication, division and square root using abacus.
Learn Chinese
Good to know http://www.froola.com. Mathematical_tools
Suan pan in Various Number Systems at cut-the-knot
Suan pan in various number systems
Soroban in Various Number Systems at cut-the-knot
Soroban in various number systems
Abacus in Various Number Systems at cut-the-knot
Abacus in various number systems
Full text of translation of "Sketch of the Analytical Engine" by L. F. Menabrea with Ada's notes and extensive commentary babbage sketch
Sketch of The Analytical Engine
From Analytical Engine to Electronic Digital Computer: The Contributions of Ludgate, Torres, and Bush , Annals of the History of Computing, Volume 4, Number 4, October 1982.
The Analytical Engine at Fourmilab babbage
The Analytical Engine
30th Anniversary of the Calculator – From Sharp's web presentation of its history; including a picture of the CS-10A desktop calculator
1994
On TI's US Patent No. 3819921 – From TI's own website
Electronic Hand-Held Calculator
MyCalcDB : 70's and 80's calculators database
MyCalcDB
French Casio Calculator Community
Graph100:PagePrincipale
International Casio Calculator Community
Universal Casio Forum
Number pad typing tutorial
free ten key number pad course - lesson one
HP Calculator Wiki
Calculators - Main.HomePage
slide rules/mech. section
Early Calculators
The Museum of HP Calculators
The Museum of HP Calculators
Broken Calculator cut the knot curriculum arithmetic
A Broken Calculator
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