Engraved plate showing a coiled apparatus with tubing above and a glass vessel over a pail beside a smoking furnace box, labelled Fig. 39 and Fig. 38.

Engraved apparatus for air and sap experiments, Hales 1727

An engraved plate of two laboratory setups labelled Fig. 39 and Fig. 38 with letters a through x. Above, a cylindrical coil with a tube runs to a funnel; below, a glass vessel sits over a pail beside a tube leading to a furnace box emitting smoke. Fine hatched line engraving on paper, page marked p. 262.

Artist: Stephen Hales
Date: 1727
Medium
Source: Wellcome Collection
Size: 2449 × 4000 px

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Public domain · Wellcome Collection marks it Public Domain Mark; made by 1727.
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

scientific illustration copperplate engraving natural history furnace laboratory apparatus glass vessel hatched line engraving