Warren de la Rue (1815-1889), British astronomer and chemist. Despite his many achievements in the field of chemistry, such as the invention of the silver chloride battery, de la Rue is best known for his pioneering astrophotography. Following his early experiments into the wet-plate or collodion process of photography, he produced highly detailed images of the Moon. During the 1850s he developed the photoheliograph, or telescope adapted to photograph the surface of the Sun. He was awarded the Gold Medal of the Royal Astronomical Society (RAS) in 1862 and the Royal Medal of the Royal Society in 1864. He served as president of the RAS from 1864-6.