Warren de la Rue, British astronomer and physicist, 1882. De La Rue (1815-1889) was a brilliant astronomer who discovered 525 nebulae. A pioneer of astronomical photography, he invented the photoheliograph, a device which allowed the Sun to be mapped using photography. De la Rue also invented the silver chloride battery, researched the discharge of electricity in gases and carried out research on photo-active chemicals and the wave theory of light.
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