Good boxwood foot measure for shoe sizes Men/Ladies/Boys and Girls-marked P.Patent 29036 in good condition=£80
Fathom depth measure c1870 for use with depth sounding-made by James White Glasgow=£100
Slide rule for use with Sikes hydrometer-unsigned-unusual scales-Extract per barrel/Pounds per barrel gravity/shillings per quarter etc.=£80
Hutchinsons Stereographic Protractor for circle 2.5 inches radius-W H Harling 47 Finsbury Pavement London Maker-One nick out of scaleas shown-Messy handwritten formula notes on reverse on paper-can easily be removed=£90
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.