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Updated: May 17, 2025
The luminous outburst by which they became visible was explained by Sir William Huggins, in a lecture delivered at the Royal Institution, May 13, 1892, on the tidal theory of Klinkerfues and Wilsing.
Wilsing, from certain anomalous displacements of their photographed images, concluded in 1893 the presence of an invisible third member of the system, revolving in a period of twenty-two months; but the effects noticed by him were probably illusory.
An attempt, it is true, made by M. Wilsing at Potsdam in 1888 to determine the solar rotation from photographs of faculæ had an outcome inconsistent with this view of their origin. They unexpectedly gave a uniform period. No trace of the retardation poleward from the equator, shown by the spots, could be detected in their movements.
Other methods have been employed in late years by other experimenters, such as the method of Baron Eötvös, founded on the use of a torsion lever, the method of the ordinary balance, used especially by Professors Richarz and Krigar-Menzel and also by Professor Poynting, and the method of M. Wilsing, who uses a balance with a vertical beam.
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