A 19th-Century double-plate electrostatic friction machine,

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A 19th-Century double-plate electrostatic friction machine,
by Paul Rousseau & Cie, the twin 22in. (56cm.) diameter plates mounted on an ebonite axis with supporting rollers, mounted on two glass insulating rods connected to the upright supports with similar ebonite rollers and insulators, the mahogany frame with twin lacquered-brass cones, driving handle and leather bands, with maker's label and discharge attachments, the base -- 24¾in. (63cm.) wide

See Colour Plate 1

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