Early Calculators (original) (raw)

These pages exhibit some non-HP calculators that were introduced anywhere from centuries ago to the late 1960's.

• Slide Rules
  • History
  • Basic Instructions and Straight Rules
  • Large Rules, Complicated Rules & Sectors
  • Circular Slide Rules
  • Cylindrical Rules
  • More (Mostly Straight) Slide Rules
• Planimeters
• Calculating Machines
  • Adding Machines
    * Dial, Slide And Chain Adders
    * Printing Models
    * Direct Adders (Comptometer, Burroughs & Speedee)
  • Four Function Mechanical Calculators
    * Large Hand Driven Models
    * Motor Driven Models
    * Curta Handhelds
  • The Amazing Friden SRW (With Automatic Square Roots)
  • How Calculating Machines Worked
    * Rocking Segment Mechanism
    * Stepped Drum Mechanism (Leibniz/Thomas)
    * Stepped Drum Mechanism (Curta)
    * Pinwheel Mechanism (Odhner/Baldwin/Brunsviga)
    * Monroe Mechanism
• Early Electronic Models
  • The Friden EC 132 (A very early pre-RPN calculator)
  • A Typical Late '60s Electronic Model (Sharp)

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