The story is about the trial of some corrupt cops in Memphis. Testimony about a gambling bust they were involved in is transcribed:
Mr. Stonebraker, a detective, testified that the machine found on Horton [a gambler] was called a gun, and was used by a certain class of gamblers to cheat by giving themselves big hands of cards. He explained now the swindle was practiced by such scoundrels as used this machine.
Major Yowlell testified that the machine found on Horton was one used by gamblers to cheat at cards.