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Disc electrical machine

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Disc electrical machine
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This small disc electrical machine was used in electrical experiments by the gentleman scientist William Henry Fox Talbot (1800-77), the inventor of positive-negative photography. It dates from around 1850, and was probably used in association with the papier-mache head. It is unsigned.

The single glass plate is supported in a mahogany frame, with flat uprights and a cross-piece. The prime conductor consisted of a central brass tube with hemispherical ends. It was attached to a solid glass stem, slid into a brass dovetail socket on one of the uprights. Two curved brass arms were screwed to the sides of the prime conductor, ending in collecting combs. The plate was rotated by the handle.

Although unsigned, this small electrical machine is an English-type plate machine of the third and final pattern devised by John Cuthbertson, probably first designed by him in London in about 1798. It may have been supplied to Talbot by the London instrument makers Watkins & Hill, who provided him with other electro-magnetic apparatus.

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