A good and rare example of Henry Hooper’s table clamp letter scale. This was the first registered design No.1 12 August 1839. The clip is marked Hooper’s Spring Holder. The circular counter weight marked ‘The Post Office Letter Weight’
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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.