Thompson Evacuator by Weiss, marked Weiss Strand. Made of Brass, glass and rubber but missing the end valve as shown on image from Tiemann Catalogue. The rubber has now hardened and has a longitudinal crack as shown. This is an uncommon instrument for evacuation of stone debris following a lithotomy operation.
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.