Great Glass Piercing Mystery
The advertisement from a Davenport catalogue shows the effect. The magician shows a sheet of glass held within a polished wooden frame. A playing card is placed on each side of the glass in the centre, the cards being held in place by the metal spring clips. The magician, and even members of the audience, can now push a rod right the way through the two cards, piercing the glass at the same time. The cards can then be removed showing that the glass is intact.