Mazes and labyrinths; a general account of their history and developments (1922)
Matthews, William Henry, 1882- · London, New York, etc. Longmans, Green · leaf 297
cannot be seen but are indicated on the out-side of the case. The Man is invisible during hisjourney. 205 At about the same time a somewhat similar toy wasbrought out by J. Proctor, in which, however, the travel-ling ball can be watched through the glass top, the puzzleelement in this case… … L^
Labyrinths
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