Conversation so far:
Who was William Hope?
William Hope (1863 – 8 March 1933) was a pioneer of so-called spirit photography.
How was william hope a fraud?
William Hope had been found guilty of deliberately substituting his own plates for those of a sitter.
What are some other interesting aspects of Harry Price?
In 1932, Harry Price travelled to Mount Brocken in Germany with C. E. M. Joad and members of the National Laboratory to conduct a 'black magic' experiment.

Question: What happenend in this experiment?
Self-contained rewrite: What happenend in Harry Price's Brocken experiment?