Trundle wheel

Trundle wheel

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Credit: SCIENCE PHOTO LIBRARY

Caption: Trundle wheel. This is used to measure approximate distances across large pieces of ground. The wheel has a circumference of one metre. It is pushed along the ground, so moves one metre for each revolution (assuming no slip). A device counts the number of revolutions and hence the distance covered. This is a simplified version of a surveyor's wheel.

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Keywords: approximate, counter, distance, ground, line, linear, measurement, measuring, metre, metric, odometer, push, pushing, surveyors, trundle wheel, walking

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