The Changeable Watch
Borrow a watch from any person in company, and request the whole to stand round you. Hold the watch up to the ear of the first in the circle, and command it to go; then demand his testimony to the fact. Remove it to the ear of the next, and enjoin it to stop; make the same request to that person, and so on throughout the entire party.
Explanation. You must take care, in borrowing the watch, that it be a good one, and goes well. Conceal in your hand a piece of loadstone which, so soon as you apply it to the watch, will occasion a suspension of the movements, which a subsequent shaking and withdrawing of the magnet will restore. For this purpose, keep the magnet in one hand and shift the watch alternately from one hand to the other.