An attractive example of Art Nouveau designed Locke Adder. Invented by Clarence Locke (1865-1945) this is the first patent which was improved by a second in 1905. This was the first American adder to enjoy commercial success. For more information ssee nzeldes.com. In good working order, possibly missing felt cover to base.
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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.