Estimated Date: 1914
Name: Sphygmomanometer, Nicholson"Princo”
Manufacturer: Precision Thermometer and Instrument Co.
Description: Oak box, 8× 2.25× 1.5” which lifts lid to reveal manometer folded in half. Extends with ivorine scale to 300 mm Hg. The reservoir is at the side about 3 x .75. When the tube folds down a valve closes to prevent the loss of mercury. The base contains directions on a metal plate. Serial number 3840.
Reference 1: 401