Two cards being drawn by different persons, are put into separate
tea-caddies and locked up. The performer changes the cards without
touching them, or any confederacy.
The caddies are made with a copper flap, which has a hinge at the
bottom, open against the front, where it catches under the bolt of the
lock, so as when the lid is shut and locked, the flap will fall down
upon the bottom; the performer places two cards that he intends to be
chosen between the flap and the front, which being lined with green
cloth, may be handled without any suspicion; he then desires the first
person to put his card into one of the caddies, taking care it be that
which contains the contrary card from the one that he chose, and the
second into the other; he then desires they will lock them up, which
unlocks the flaps, covers their cards, and when opened, presents the
contrary ones.