ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY ROSENFELD IMAGES LTD / SCIENCE PHOTO LIBRARY
Surveying. Two foremen survey a construction site with a theodolite. They are holding a plan of the proposed building. A theodolite is a mounted telescope which is used to measure horizontal and vertical angles. Construction can be planned by surveying the site to establish control points and then building from the design plans by use of these control points.
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