Mechanical Puzzles
It would be impossible to give a complete list of the subjects that might be fairly classed under Mechanical Puzzles. What is a puzzle to one generation is none to the next, and so on; new puzzles are constantly being invented and found out. There are a few old ones around which a considerable amount of interest must centre because of their intrinsic merit, and which should find a place in every book prepared for the amusement and recreation of youth; there are also new ones not yet much known, which should be mentioned more because of their newness, perhaps, than their merit.