Slide calculator - Wikipedia

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File:BLW Mechanical Calculator (1).jpg - Wikipedia

Slide rule - Simple English Wikipedia, the free encyclopedia

Mic-UK: A gallery of a selection of calculating aid designs spanning over 2000 years.

File:Vintage Unisonic 888 Slide Rulette Electronic Pocket Calculator, Made In Japan. Circa 1974 (41142661685).jpg - Wikimedia Commons

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File:Vintage Texas Instruments Model SR-10 Pocket LED Calculator, First of a Line of TI Slide Rule Models, Sealed Battery, Price - 149.95 USD, Circa 1972 (14592862578).jpg - Wikimedia Commons

Slide rule - Wikipedia