Short Gunter Rule 12 inches-boxwood-unsigned-minor ink stains on bevel-scales=Num/Sin/Tan/Mer/Rum etc.= £100
Eighteenth Century? unusual brass rule twelve inches-marked JR crown=£100
Twelve inch electrum scale rule marked ‘Stanley-trade mark-London’ scales 1/2,1/4,1/8 and inches=£80
Lignum Vitae Parallel rule marked ‘Stanley London, Made in England= £60
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.