Hoffmann, Professor, 1839-1919 · London : Frederick Warne · leaf 88
so that any one attempting tounscrew it in the ordinary way only fixes it the tighter. If,on the other hand, he makes the usual movement of screw-ing, the lid comes off without difficulty. Key to Trick or Secret Puzzles. 65 No. XXXVI.—The Ne Plus Ultra Match-box.Solution. It will be observed that… … Fig. CO. direction shown by the arrow in Fig. 90. The secret liesin the fact that the lid works on a pin hinge, pivoted be-tween the two ends of the box, though the pins do not comethrough, and are not perceptible from the ontsicle. The lidtherefore forms, in fact, a lever, pressure on whose…
Puzzles
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