An arrangement of five Arachnoidiscus ehrenbergii. Mounted in ‘GBI163’ and dated October 1970. More on the mountant in a minute. Prepared by Eric Impey. Olympus BHB microscope using 450nm LED light. 10x Nikon Plan Apo NA 0.45 objective. Olympus Aplanat Achromat condenser, brightfield lighting. 2.5x Nikon CF PL photoeyepiece. Monochrome converted Nikon d850 camera. 25 images stacked in Zerene (Pmax).
Back to the mountant. ‘G.B.I. 163’ by G.B.I. (Labs) Ltd. See Alfred Kjemperud, 1981, A shoreline displacement investigation from Frosta in Trondheimsfjorden, Nord-Trøndelag, Norway, Norwegian Journal of Geology, 61, 1. Also see: Evans, G. H. (1970). Pollen and Diatom Analyses of Late-Quaternary Deposits in the Blelham Basin, North Lancashire. The New Phytologist, 69(3), 821–874. http://www.jstor.org/stable/2430534 . This refers to ‘Mikrops 163’, with an RI of 1.63 obtainable from G.B.I. Laboratories Ltd, Heaton Mills, Heaton St, Denton, Manchester and being used for diatom and pollen mounting. Not the best wetting of the diatoms on this slide though. RI certainly looks nice and high.
Arachnoidiscus ehrenbergii Bailey, 1849. Published in: Ehrenberg, C.G. (1849). Weitere Mittheilung über Resultate bei Anwendung des chromatisch-polarisirten Lichtes für mikroskopische Verhältnisse. Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1849: 55-76. Page 64, adnot..