5.D.5. MEASURE HALF A BARREL
I have just started this and there must be much older examples.
Benson. 1904. The water glass puzzle, p. 254.
Dudeney. AM. 1917. Prob. 364: The barrel puzzle, pp. 109-110 & 235.
King. Best 100. 1927. No. 1, pp. 7 & 38.
Collins. Fun with Figures. 1928. The dairymaid's problem, pp. 29-30.
William A. Bagley. Puzzle Pie. Vawser & Wiles, London, nd [BMC gives 1944]. [There is a revised edition, but it only affects material on angle trisection.] No. 14: 'Arf an' 'arf, p. 15.
Anon. The Little Puzzle Book. Peter Pauper Press, Mount Vernon, NY, 1955. P. 52: The cider barrel.
Jonathan Always. Puzzles for Puzzlers. Tandem, London, 1971. Prob. 87: But me no butts, pp. 42 & 88.
Richard I. Hess. Email Christmas message to NOBNET, 24 Nov 2000. Solution sent by Nick Baxter on the same day. You have aquaria (assumed cuboidal) which hold 7 and 12 gallons and a water supply. The 12 gallon aquarium has dots accurately placed in the centre of each side face. How many steps are required to get 8 gallons into the 12 gallon aquarium? Fill the 12 gallon aquarium and tilt it on one corner so the water level passes through the centres of the two opposite faces. This leaves 8 gallons! Nick says this is two steps.
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