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Magic Stones and Electric Gems: Boot

An ingenious magnetic oracle is described by De Boot. This consisted of a round board, about the edge of which were marked the letters of the alphabet, while in the centre there stood a small wooden figure, set on a pivot, and holding extended in one hand a little wand. One foot of this figure was slightly advanced and within it was concealed a small iron ball. The experimenter held in his hand a wooden sceptre, with a powerful loadstone at its top, and as he touched with his sceptre the lower side of the board, beneath the spot on which any one of the letters was marked, the attraction exercised by the loadstone on the iron made the figure revolve on its pivot so that the little wand pointed toward the letter indicated. In this way any word could be spelled out and appropriate answers given to any question. The device would be too obvious at present, but in De Boot's time it would have served well enough to mystify the spectators.