Extract the answer to the following question from the movie plot. If the question isn't answerable, please output "Can't answer". Question: What does Tanner attempt to destroy? Title: The Legend of Hell House Movie plot: Physicist Lionel Barrett is enlisted by an eccentric millionaire, Mr. Deutsch, to make an investigation into "survival after death" in "the one place where it has yet to be refuted." This is the Belasco House, the "Mount Everest of haunted houses," originally owned by the notorious "Roaring Giant" Emeric Belasco, a six-foot-five perverted millionaire and supposed murderer, who disappeared soon after a massacre at his home. The house is believed to be haunted by numerous spirits, the victims of Belasco's twisted and sadistic desires.Accompanying Barrett are his wife, Edith, as well as two mediums: a mental medium and Spiritualist minister, Florence Tanner, and a physical medium, Ben Fischer, who is also the sole survivor of an earlier investigation. The rationalist Barrett is rudely sceptical of Tanner's Christian faith and spiritual beliefs, asserting that there is nothing but unfocused electromagnetic energy in the house. Barrett brings a machine he has developed, which he believes will rid the house of any paranormal presence or force.Though not a physical medium, Tanner begins to manifest physical phenomena inside the house. When, after a quarrel with Tanner, Barrett is attacked by invisible forces, he suspects that Tanner may be using the house's energy against him. Meanwhile Fischer remains aloof, with his mind closed to the house's influence, and is only there to collect the generous pay offered him to return.Edith Barrett is subjected to erotic visions late at night, which seem linked to her lackluster sex life. She goes downstairs and, in a seeming trance, disrobes and demands sex from Fischer. He instead strikes her, snapping her out of the trance, and she returns to herself, horrified and ashamed. A second incident occurs a day or so later (this time, she is awake but uninhibited due to alcohol); her husband arrives a moment later to witness her advances to Fischer and is resentful, stating to Fischer's face that he believes that Fischer no longer has any psychic ability and that "Mr. Deutsch is...
Barrett's machine