corresponded with scientists on the subject. He was photographed an extraordinary number of times. The photographs of Faraday held in the Institute of Engineering and Technology Archives include a very early example of a calotype (an early photographic process where the image is produced on paper treated with silver iodide and allowed to develop in sunlight) and a telephotograph.
Recently, a series of his Royal Institute evening lecture notes, compiled by Maria Herries, including one on The Daguerreotype in 1848, was sold at Bonhams for £5,400. Full description of the lot can be found here.
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