John Rand Capron

John Rand Capron (1829–1888) was an English amateur scientist, astronomer and photographer. Though a solicitor by profession, he became an expert on spectroscopy, particularly in relation to the aurora, and published many articles during his lifetime.

He is also remembered for a speculative letter, in the scientific journal Nature on early incidences of "crop circles", in which he suggested they were caused by "cyclonic wind action".

Capron was born on 19 February 1829 in St. Leonards, Shoreditch, London, the son of a leather merchant. Educated at the Royal Grammar School, Guildford, he was articled to his uncle John Capron, a prominent Guildford solicitor. He entered into partnership with his uncle in 1850, and was also appointed Borough Coroner and Clerk of the Peace.

His obituary in the Monthly Notices of the Royal Astronomical Society described how at while at school, during convalescence from an attack of typhoid fever, he had been lent a microscope, which "opened out a new world of wonder and beauty" for him. Although initially interested in biology, fossils and the study of geology, he later developed a particular enthusiasm for the study of spectroscopy and astronomy, building a private observatory at Guildown on the "Hog's Back", Surrey. In 1877 he published a significant work on "Photographed Spectra", which provided reference photographs of the spectra of various elements. In 1879 he extended this into a study of the characteristics of the aurora, and in 1883 published an analysis of an extremely unusual phenomenon observed during the aurora of 17 November 1882; Capron was one of the first scientists to seriously research the nature of aurorae, particularly from a spectrographic perspective. He also conducted experiments on atmospheric electrical charges, fixing a "corona" of platinum wires on top of Booker's Tower on the Hog's Back, linked by wires to his observatory.

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