- Subject
- Photography
- Item type
- Object
- Makers
- Henri Heurck
- Provenance
- Royal Microscopical Society. Presented to the RMS by Henri van Heurck in 1890.
- Primary inscriptions
- Manuscript label below: 'Photograph of P. angulatum, made with objective of 1.6 N.A., using strictly axial illumination. (Journ. R. Mic. Soc. 1890 p.261) Dr. H van Heurck.'.
- Dimensions
- Height: 150mm Width: 113mm
- Inventory No
- 12066
Description
Ealy gelatine print, yellow to brown sepia, mounted on black card with decorative border; bottom corners of card broken. Shows the jagged tip of Pleurosigma angulata. The photograph was presented at the March 19, 1890 meeting of the RMS. It both demonstrated the capability of the new Zeiss apochromatic objective of numerical aperture 1·6, and illustrated a point in the study of the structure of the diatom Pleurosigma angulatum. It was reported on pages 261 and 269 of the Journal of the RMS, Van Heurck's note being reproduced on page 261.
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