| Henry Fox Talbot Photomicrograph of a botanical specimen, air fern (Sertularia) n.d. Waxed paper negative 6.9 x 6.1 cm National Science and Media Museum Science Museum Collection, Object number: 1937-2030, Schaaf no. 1493 LL/83519 Possibly a hairline crack in a coverglass shows as a curved white line.
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