PD could not help wondering what is going on here. He noticed that a girl would give him at least passing attention by agreeing to dance with him.
What was this irresistible signal that excited us to dance madly about; How was it conveyed?
PD was wondering what was the nature of these devices that we were all drawn to. The speaker box, the record; and what was it that made it work. Is it not the same stuff that allowed him to use a transformer to prank girls while holding the leads as he broke the circuit across the battery.