Logarithmic Tables

First Devices

The first “Computer Manual”


Conversion Devices

Slide Rules

Cylindrical Slide Rules

Circular Slide Rules

Troncet Type Devices

Keyboard Adding Machines


True Multiplying Calculators

Proportional Rod Calculators

Pinwheel Calculators


Curta Calculators

Motorised Calculating Machines

Electronic Calculators



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Page last modified on 05 December 2011