An instrument designed to measure angles, particularly the angles formed by surface features or geological formations.
From Latin 'angulus' (angle) combined with Greek 'metron' (measure). This technical instrument follows the standard scientific naming pattern for measuring devices, similar to 'altimeter' or 'barometer.'
Before digital tools, surveyors and geologists used angulometers like early protractors on steroids—they're forgotten now but they represent how scientists used to solve problems one physical instrument at a time!
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