Two permanent horse-shoe magnets are placed as shown n Fig.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
While acting as professor at Strasburg, he procured powerful magnets with the view of comparing the actions of their poles and, if possible, of introducing by their aid among the forms of crystals a manifestation of dissymmetry.
"Makers of Modern Medicine"
James J. Walsh
The coffin and the green mound are cruel magnets.
"The Jericho Road"
W. Bion Adkins