This device is a modification of the Dudgeon, but with a 2 inch rod which extends and has an adjustable weight to adjust the pressure rather than a screw spring. The clockwork mechanism turns the smoked paper on a rod drive. the rod has a series of plates to mark the paper and provide a scale of height. See N. H. Naqvi and M. D. Blaufox page 110.
Case lid distressed as shown-Label for retailer ‘Medicinisches Waarenhaus, Berlin’-most likely manufactured by Allen and Hanbury but not marked for maker
Ask the Dealer
Fletcher Wallis sells objects and books relating to the history of science, medicine and technology from his unit at Admiral Vernon Arcade Portobello Road. He publishes books through Vernier Press, including Antique Medicine Chests, and Corkscrew Patents from 1795. He has been dealing for thirty five years.