ELD4960779 Spiritism: the magnetic chain, the participants form a chain by touching each other\'s little finger in order to summon spirits around 1870. 19th century, (engraving).; Private Collection; (add.info.: View of a seance, attempt to communicate with spirits, practitioners seating manner in a circle touching each other\'s little finger, circa 1870.); Photo by The Holbarn Archive.