Whenever a road is built or worked on, a worker is looking through one of those telescopes on a tripod. I assume they are surveying or measuring straightness. please?
In: Technology
They are called total stations. They measure angles and distances from point within line of sight of the total station.
Super simple use example. You have a known point and then you use to total station to measure other points. When building roads you need to know where and how high the road is supposed to be based on blueprints at each point.
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