P. T. Barnum,
The Humbugs of the World — Chapter IX
(1866)
“ To prevent any one getting hold of them while operating, they hit upon the plan of passing a rope through a button-hole of each gentleman’s coat, the ends to be held by a trusty person—assigning, as a reason for that arrangement, that it would then be known no one in the circle could assist in producing the manifestations. The plan did not always work well, however; for a skeptic would sometimes cut the rope, and then pounce upon “the spirit”—that is, if he didn’t happen to miss that individual, on account of the darkness and while trying to avoid a collision with the instruments. ”
