Mechanical Calculators - Articles

The Millionaire Calculator Jim McDermaid Notes and internal views on the Millionaire Calculators, and Nicholas Bodley's comments.

The Amazing Curta! Bruce Flamm An article on the development of Curta calculators.

Electrically-driven, nonprinting, rotary mechanical desktop calculators Nicholas Bodley Some general remarks about how they worked.

Some notes about Friden calculators Nicholas Bodley Brief Company History and Models - Recollections by a former employee

A few comments about Monroe calculators Nicholas Bodley Brief Company History and Models

Some notes about Marchant calculators Nicholas Bodley Brief Company History and Models

Marchant: Some Preliminary Remarks Nicholas Bodley Interesting discussion of Marchant's internal mechanisms.

The Curta Calculator Nicholas Bodley

Memorised Description of Comptometer Mechanism Ray Mackay Operations and adjustments for Felt & Tarrant Comptometers.

Comptometer Photos - (Inside Mechanism)  Ray Mackay Internals pictures of a WM (War Model) Comptometer (SN 438459)

Recollections on the MADAS Calculator Ray Mackay History and description of MADAS calculators.

MADAS Photos - (Inside Mechanism)  Ray Mackay Internals pictures of the MADAS 20BTZG.

Burroughs Adding Machine Company Glimpses into the Past - Tools of the Trade Michael Hancock Description of maintenance tools by a former Burroughs Field Engineer.

Wenhua Mechanical Calculators Wj Wang An article about Chinese Wenhua (Culture) mechanical calculators.

X-Number World

Revised: August 19, 2011.