Cavendish, The Laws and Principles of Whist Stated and Explained…
“ A player who desires the cards to be placed, or who demands to see the last trick, [38] should do it for his own information only, and not in order to invite the attention of his partner.No player should object to refer to a bystander who professes himself uninterested in the game, and able to decide any disputed question of facts; as to who [Pg 20] played any particular card—whether honours were claimed though not scored, or vice versâ—etc., etc.It is unfair to revoke purposely; having made a revoke, a player is not justified in making a second in order to conceal the first. ”
