Engraving from Schem. 5 of the first edition of Robert Hooke's seminal volume, Micrographia : or, Some physiological descriptions of minute bodies made by magnifying glasses. With observations and inquiries thereupon. Depicted here are an assortment of specimens used in Hooke's study of fiery sparks produced by striking flint against steel, as described in Observation VIII.
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Hooke, Robert. “Microscopic View of Flint or Steel.” In Micrographia : or, Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses. With Observations and Inquiries Thereupon. London, England: J. Allestry, 1665. https://digital.sciencehistory.org/works/vx021g27g.
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