Hoffmann, Professor, 1839-1919 · London : Frederick Warne · leaf 74
joint length of three-eighths ofan inch. In this cavity is a little brass bolt, a quarter of aninch in length, working freely up and down within it. Key to Trick or Secret Ptizzles. 5i When the lower part of the box is screwed into the other,(which is done with the castle bottom upwards) the… … 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…
Puzzles
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