6.E. FLEXATUBE
This is the square cylindrical tube that can be inverted by folding. It was also invented by Arthur H. Stone, c1939, cf 6.D.
J. Leech. A deformation puzzle. MG 39 (No. 330) (Dec 1955) 307. Doesn't know source. Says there are three solutions.
M. Gardner. Flexa-tube puzzle. Ibidem 7 (Sep 1956) 129. Cites the inventors of the flexagons and the articles of Maunsell and Leech (but he doesn't have its details). (I have a note that this came with attached sample, but the copy I have doesn't indicate such.)
T. S. Ransom. Flexa-tube solution. Ibidem 9 (Mar 1957) 174.
M. Gardner. SA (May 1958) = 2nd Book, chap. 2. Says Stone invented it and shows Ransom's solution.
H. Steinhaus. Mathematical Snapshots. Not in the Stechert, NY, 1938, ed. nor the OUP, NY, 1950 ed. OUP, NY: 1960: pp. 189 193 & 326; 1969 (1983): pp. 177-181 & 303. Erroneous attribution to the Dowkers. Shows a different solution than Ransom's.
John Fisher. John Fisher's Magic Book. Muller, London, 1968. Homage to Houdini, pp. 152 155. Detailed diagrams of the solution, but no history.
Highland Games (2 Harpers Court, Dingwall, Ross-Shire, IV15 9HT) makes a version called Table Teaser, made in a strip with end pieces magnetic. Pieces are coloured so to produce several folding and inverting problems other than the usual one. Bought in 1995.
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