Three cased Proportional dividers
00-marked for Thomas Jones, 62, Charing Cross, London £180 c1850
01-marked for Gilbert & sons London £140 c1830
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.