Horrors of the Black Museum (1959)

Synopsis
The power of hypnotism provides the basis of this film that was released in "Hypnovision" (yet another promotional gimmick) A budding and frustrated mystery writer takes extreme steps to insure that his latest thriller contains accurate descriptions of horrible murders in this gory horror thriller. He decides that the best way to do this is to set up and witness similar murders first- hand, so, not wanting to bloody his own hands, he hypnotizes his assistant, turns him into a deformed monster and has him do the dirty work using a few devilishly clever gadgets that include binoculars equipped with spring-loaded spikes, a secret guillotine poised above a young woman's bed, and deadly ice tongs. Afterward, the writer drops the bodies in a vat of acid. Several people die before the assistant rebels and gets bloody revenge. ~ Sandra Brennan, All Movie Guide