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Warren de la Rue

astronomer, physicist
Born: 1/15/1815
Birthplace: Guernsey, United Kingdom

After studying in Paris, he began working in his father's papermaking business, inventing an envelope-folding machine. He went on to invent the silver chloride battery, to do research on the discharge of electricity in gasses, and to invent the photoheliograph for use in celestial photography.

Died: 4/19/1889