The effect is the magical production of a huge display of flags. Davenports sold this trick in the 1930s based on the method used by Stanley Collins. A Davenport advertisement includes: ‘In producing this wonderful effect, we have discarded the old iron flag sprays that we had on the market many years ago and now introduce our special Demon featherweight aluminium flag sprays. Beautifully made. None genuine without the Demon Trade mark.’ It is known that Jon Martin, the famous magical mechanic, produced some aluminium flag sprays for Davenports. There are three sprays of flags which fit together to produce the overall effect, the largest spray being at the bottom. The illustration is from a Davenports catalogue.