A pioneer in the field of astrophysics, Johann Zoellner (1834-1882)
was a professor of physics and astronomy at the University of
Leipzig and an associate of the Royal Astronomical Society.
Zoellner was best known for his work on astronomical photometry and
spectrum analysis, on which he published widely. He invented the
astronomical photometer used for measuring stellar magnitudes. He
was also interested in optical illusions: the 'Zoellner illusion'
consists of straight parallel lines which appear to be unparallel.
This book, published in German in 1878-1879 and translated into
English by Charles C. Massey in London in 1880, exemplifies the
shift in Zoellner's interests in later life: he became involved in
the public debate surrounding the scientific veracity of
spiritualism. Here Zoellner describes his observations of
experiments conducted by the medium Henry Slade in his own home.
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