The trick has three components: a thin rod, a cylinder and a block which slides easily into it. The cylinder and block are pierced with holes and when the block is impaled within the cylinder, escape is impossible – unless by magic. The magician slides the block into the cylinder and the rod is thrust through and held by members of the audience. With a little tap on the cylinder the block drops out. Everything may be examined before and afterwards. Complete with instructions copyright L.D. & Co., London. A 1950 Davenports advertisement is also illustrated here.