1: Underside of stinging nettle leaf 2: Beard of wild oat used in Hooke's hygrometer. 3: Section of head of wild oat. 4: Hooke's hygrometer. From Robert Hooke 'Micrographia' London 1665. Engraving .

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1: Underside of stinging nettle leaf 2: Beard of wild oat used in Hooke's hygrometer. 3: Section of head of wild oat. 4: Hooke's hygrometer. From Robert Hooke 'Micrographia' London 1665. Engraving .

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Photo credit: © World History Archive / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., 1, 2, 1665., 1:, 2:, 3:, 4:, archival, archive, beard, british, english, engraving, head, historical, history, hooke, hygrometer., instrument, leaf, london, micrographia, microscope, microscopy, nettle, oat, oat., observation, robert, science, scientific, section, stinging, underside, wild