It was called the Tucker Telephone.
The Tucker Telephone is a torture device designed using parts from a old-fashioned crank telephone. The electric generator of the telephone is wired in sequence to two batteries so that the instrument can be used to administer electric shocks to another person. The Tucker Telephone was invented by a trustee who acted as the "resident physician" at the Tucker State Prison Farm, Arkansas, in the 1960s.
Thank you. I always thought "2001 Space Odyssey" was an Emperor with no clothes. I pretended to understand it until I got older and realized it was just a dumb movie.