Abstract
IN the number for November 18, 1869, of NATURE, “J.” asks if an experiment has hitherto been tried to ascertain the value of the personal equation of astronomical observers. The fact is, that it has been tried in different manners, as by Mr. Wolf in Paris, and Mr. Hirsch in Neuchatel, but first of all by Dr. F. Kaiser, Astronomical Professor, and Director of the Observatory of Leiden. The apparatus of Prof. Kaiser was first constructed in 1851, but was afterwards highly improved, so that it is fitted equally well for observations with or without the chronograph.
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VON DE STADT, H. Personal Equation of Astronomical Observers. Nature 1, 337 (1870). https://doi.org/10.1038/001337c0
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DOI: https://doi.org/10.1038/001337c0
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