Antique Dudgeons Sphygmograph, an early blood pressure measuring device, invented by Dr. Robert Dudgeon in the late 1880s. The devise was to be strapped to one's wrist so their pulse could be transmitted to a lever and record onto smoked paper. The example listed here works well. When it is wound up the feed rollers turn well.
The stop lever atop the devise is functional. When the devise is placed atop a strong pulse, the needle corresponds accordingly. Its strap is in good worn condition. An original case is included though its clasp does not function and is loose.Original, as-found and excellent condition. 1890 Dudgeon Sphygmograph Blood Pressure Recorder Antique Medical Cardiology" is in sale since Tuesday, June 11, 2019. This item is in the category "Collectibles\Science & Medicine (1930-Now)\Scientific Instruments\Other Vintage Science Equip". The seller is "theantikeychop" and is located in Wethersfield, Connecticut. This item can be shipped worldwide.