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from WIRED

The Surprising Complexity of Old-School Calculators

The Surprising Complexity of Old-School Calculators | Monroe Mach 1.07, 2014. Kevin Twomey | WIRED.com

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Curta Mechanical Calculator, a small, hand-cranked mechanical calculator introduced by Curt Herzstark in 1948. It can be used to perform addition, subtraction, multiplication, division, and (with more difficulty) square roots and other operations. considered the best portable calculators available until they were displaced by electronic calculators in the 1970s.

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from eBay

Details about Antique THE BARRETT ADDING MACHINE ca.1912 Vtg Mechanical Calculator Model No.12

Antique THE BARRETT ADDING MACHINE ca.1912 Vtg Mechanical Calculator Model No.12 | eBay

from eBay

Details about Antique THE BARRETT ADDING MACHINE ca.1912 Vtg Mechanical Calculator Model No.12

Antique THE BARRETT ADDING MACHINE ca.1912 Vtg Mechanical Calculator Model No.12 | eBay