Caselli's pantelegraph: At the sending station

Caselli's pantelegraph: At the sending station the dispatch was written or drawn on sheet of metallized paper in thick insulating ink and placed on curved plate. At receiving station, sheet of paper impregnated with potassium ferrocyanide placed in plate and stylus produced imaged on the impregnated paper. Wood engraving from Amedee Guillemin Les Applications de la Physique, Paris, 1874

Amedee Applications Curved Dispatch Facsimile Guillemin Impregnated Insulating Physique Placed Potassium Sending Stylus Thick

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