Hoffmann, Professor, 1839-1919 · London : Frederick Warne · leaf 74
Fig. 78. To open the box, invert it, and give it a rap on the tableor some hard substance. This drives the little bolt backinto the upper hole, and the bottom may then be unscrewedwithout difficulty. There is a mark on the black band, above and below,which shows when the box has been screwed up… … Fig. 79. It will be found on close examination of this box thatit consists externally (see Fig. 79) of two brass cylinders,the upper one, a, being a shade larger in diameter than the 52 Puzzles Old and New. lower, b. This is in fact a tube, working within the largertube, a, with an upward and…
Puzzles
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