Estimated Date: 1900
Name: Haemadynamometer, Sphygmometer
Description: 3” sq x 1.25” black box with blue velvet lining holds 2“d x 0.5” gilded circular gauge calibrated in mm Hg from 0 to 250. The name Hawksley is printed on the dial and the word Patent. Extending from the bottom of the gauge is a 3/8” sensor on a 0.5” rod which activates the needle to read the gauge. Also a ring on the bottom holds a rubber pelot, which is in the box but is now hardened.
Reference 1: 403