Engraved plate with seven numbered figures: a standing man with straps, an Archimedes screw, a tube instrument, an armillary sphere, a quadrant and an astrolabe.

Orthopedic traction, Archimedes screw and astronomical instruments, 1769

An engraved plate from a dictionary of arts and sciences showing seven numbered figures: a standing figure with straps, an Archimedes screw, a thermometer-like tube, an armillary sphere on a stand, a quadrant, and an astrolabe. Fine black-line etching on paper with printed lettering at top and bottom.

Artist: Unknown
Date: [1769]
Medium: Etchings
Source: Wellcome Collection
Size: 2456 × 4000 px

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Public domain · Wellcome Collection marks it Public Domain Mark; made by 1769.
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

18th century 1760s 1769 engraving etching astronomy scientific instruments armillary sphere copperplate print quadrant