"You know exactly how all of them work, then?" He saw where I was heading. "Most of them," he hedged. Thursby saw where I was heading, too, and was sweating. I'd managed to get around his objection. "Have you ever examined any which you could not understand?" "I ... I don't quite know what you mean." "Have you ever," I said firmly, "come across a device used in cheating which you could not comprehend or explain the operation of?" Thursby stood up. "Same objection as before, Your Honor." "Your Honor," I said, "I am merely trying to find the limitations of the witness' knowledge; I am not trying to refute his acknowledged ability." "Overruled," said Judge Lapworth. "The witness will answer the question." I repeated the question. "Yes," Thompson said in a low voice. "More than once?" "Only once." "Only once. You did find one device which didn't operate in any fashion you can explain. Is that right?" "That's right." "Can you tell me what this device was?" Thompson took a deep breath. "It was People's Exhibit A—the device taken from the defendant at the time of his arrest." There was a buzz in the courtroom. "No more questions," I said, turning away. Then, before Thompson could leave the stand, I turned back to him. "Oh, just one moment, Mr. Thompson. Did you examine this device carefully? Did you take it apart?" "I opened it and looked at it."