the influence of a powerful horseshoe magnet passed over the outside of one slate as required, the prepared chalk will produce the spirit writing.
Third Method (one slate only).—After examination the slate is held by the performer above his head, when almost immediately writing is heard; and on the slate being turned round it is found to contain the desired message.
The slate, a small one for preference, is provided with a loose vulcanite flap covering one side, and concealing the writing which is already there. The performer hands the slate round for examination (keeping the flap in position by means of the fingers), and asks a spectator to initial it in one corner to satisfy himself that it is not exchanged. This having been done, and while returning to the stage, the performer removes the flap under cover of his body and places it in the vest, or in the large pocket in the breast of the coat. He then holds the slate above his head, fingers in front and thumbs behind. The sound of writing is produced by scratching with one thumb on the back of the slate, and when this has been continued long enough the message is revealed.
