A graphometer marked H Morin a Paris 3 Rue Boursault. Basic example missing ball joint support and with sighting wires distressed. lacquer in good condition, no case
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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.
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Four Slide Rule Books various