Experiments often require monitoring movement that may be too small for the eye to see, easily seen by the eye, or over distances too great for either the eye to see or the mind to comprehend.
Recordings of movement can be made electronically by using various transducers to determine both time and position. The range of movement recorded varies from minute, elastic material expansions requiring Wheatstone bridge strain gauges to following transcontinental migrations of species or determining astronomical ...
