Land Surveying History Hub is a place for land surveyors to discuss and share surveying history for education of future generations of surveyors. As a member of this Hub, you can contribute to the Surveying History Timeline and help Build land surveying time capsules. Contribute what your experience and knowledge to the first ever interactive timeline of land surveying history.
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.