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 yellow British Museum datestamp for 11 Oct 1851 on reverse.
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.