A surveying or engineering instrument used to measure and determine gradients or slopes of land and terrain.
From Latin gradiens (stepping, going) plus the -er suffix indicating an instrument or person. Related to gradient and gradation, all descended from gradus (step).
Before GPS, surveyors used mechanical tools like the gradiometer and gradienter to map mountains and valleys—these devices embodied sophisticated understanding of angles and slopes in their clever mechanical designs.
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