Eddington's comparator

Eddington's comparator

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Credit: VOLKER STEGER/SCIENCE PHOTO LIBRARY

Caption: Eddington's comparator. This device was built by Sir Arthur Eddington (1882-1944), and was designed for measuring changes in the positions of stars, seen on telescope glass plates mounted below the movable microscopes. Eddington would have used a comparator like this to study plates from the 1919 eclipse expeditions, designed to test Einstein's 1915 theory of General Relativity. This predicted that light passing close to a large mass (like the Sun) bends twice as far as predicted by Newton's theory of gravity. This lensing effect changes the position of stars seen near the Sun during a total solar eclipse. Eddington's results, now considered inconclusive, were said to show the shift and were hailed as support for General Relativity.

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Keywords: 1800s, 1889, 1919, 19th century, comparator, device, eclipse, eddington, einstein, equipment, experiment, general relativity, gravitational lens, history, instrument, one, physical, physics, research, single, solar eclipse

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