Estimated Date: 1880
Name: Sphygmograph, Dudgeons
Manufacturer: Medical Supply Association
Description: Classic nickle plated Dudgeon sphygmograph with intact clockwork mechanism in a square housing, ivory inset tension knob, black ribbon strap and pressure sensor and recorder for pulse on smoked paper. Contained in a black papered box, 3“x 2“x 3”. Maw. Pressure gauge is marked in Troy oz from 1 to V.
Reference 1: 122