Warren de la Rue (1815-1889), British astronomer. De la Rue was born in Guernsey and educated in Paris. He joined his father’s stationery company, but in his leisure time studied chemistry and electricity. In 1840 he demonstrated his light bulb - an evacuated glass bulb containing a platinum wire. His attention was diverted to astronomy, and he built his own 13-inch reflector telescope. Having seen a daguerrotype of the Moon in 1851, he applied the faster wet collodion process to astrophotography for the first time and made many excellent images of the lunar surface. He invented the photoheliograph for photographing the Sun, and in later years published widely on electrical discharge through gases.
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