Charles Rundle Davidson coauthored the original report of the 1919 Eddington experiment, with Frank Watson Dyson and Arthur Eddington. His contribution belongs to an observational project that compared stellar images taken during a total solar eclipse with reference images.
Comparing stellar positions on eclipse and reference plates tested a small radial displacement. Changes in plate scale and focus could alter the signal, so the report assessed instrumental errors alongside its gravitational interpretation.[ref]
A determination of the deflection of light by the Sun's gravitational field by Frank Watson Dyson and others. 1919 observations and 1920 report: observing arrangements, plate comparisons and inferred solar-limb deflection
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