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triangulation

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triangulation

Technique used in surveying to determine distances, using the properties of the triangle. To begin, surveyors measure a certain length exactly to provide a base line. From each end of this line they then measure the angle to a distant point, using a theodolite. They now have a triangle in which they know the length of one side and the two adjacent angles. By simple trigonometry they can work out the lengths of the other two sides.

To make a complete survey of the region, they repeat the process, building on the first triangle.

triangulation

Technique used in frame structures to provide strength and support. When a force is applied to a triangular frame, two of its members stretch the third one, making it tense. This in turn pulls the other two members towards it, making the structure rigid and spreading the force between all three members of the triangle.

Examples of triangulation include cross-bracing on gates, edging strips on photograph frames, and roof trusses.



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He made a triangulation of this part of the lake, but he could not procure a boat, either to cross it or to visit the great island of Ukereoue which is very populous, is governed by three sultans, and appears to be only a promontory at low tide.
Five Weeks in a Balloon by Verne, Jules View in context
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