Abstract
PHOTOGRAPHY OF THE CORONA WITHOUT AN ECLIPSE.-G. Blunck describes in Astr. Nachr., 5539, some interesting experiments on obtaining photographic images of the corona in full sunlight. He points out as the probable cause of the failure of previous attempts of this kind that they were made in too short a wave-length. He gives the percentage difference of illumination between the corona and the sky background as 0-2 per cent, at X5000, 0-8 at X7000, 1-7 at X8500, 2-5 at X9500; he states that Pinazyanol gives a maximum degree of sensitivity at X6500, Dizyanin at X7500, Neozyanin at X8000. The last named makes corona photography just possible, but the author claims to have obtained a new sensitising dve called Prozyanol, which gives a maximum sensitivity at X8500.
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Our Astronomical Column. Nature 121, 183 (1928). https://doi.org/10.1038/121183b0
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DOI: https://doi.org/10.1038/121183b0