Engraving of a hand and forearm with a strapped metal sphygmograph device on the wrist, labeled Fig. 1 The Sphygmograph.

The Sphygmograph: Wood Engraving of a Pulse-Recording Instrument

A wood engraving shows a forearm and open hand resting beneath a metal clamp-and-lever apparatus strapped to the wrist, with a recording arm and rack mechanism above. Fine hatched lines model the skin and metal, and a caption reads Fig. 1, The Sphygmograph, on the page below.

Artist: Unknown
Date: [1850/1880?]
Medium: Engravings
Source: Wellcome Collection
Size: 4000 × 1785 px

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Public domain · Wellcome Collection marks it Public Domain Mark; made by 1890.
Rights checked 2026-11-05 · tier A · as stated by the source: Public Domain Mark (Wellcome Collection)

Credit (appreciated, not required for public-domain works): Wellcome Collection

19th century engraving scientific illustration wood engraving antique print hands monochrome