Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on paper watermarked, 'J Whatman Turkey Mill 1851,' and with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on paper watermarked, 'J Whatman Turkey Mill 1849,' and with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram of algae specimen, on paper watermarked paper, 'J Whatman Turkey Mill 1849,' and with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram negative of algae specimen, on paper watermarked paper, 'J Whatman Turkey Mill 1849,' and with British Museum yellow datestamp for 11 Oct 1851 on reverse.
Genre: Scientific Photography Cyanotype negative photogram negative of algae specimen, on unwatermarked paper, but with British Museum yellow datestamp for 11 Oct 1851 on reverse.