Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 91
Q, running in or out of it; but istoo short to contain the whole of an engine, like R. Hence, if 70 GEOMETRICAL RECREATIONS [CH. IV an engine rnns up one siding, such as DBA, it must come backthe same way. Initially a small blork of wood, P, coloured to representa wagon, is placed at 5; a similar… … Another shunting puzzle, on sale in the streets in 1905,under the name of the Chifu-Chemulpo Puzzle, is made asfollows. A loop-line BGE connects two points B and ^ on arailway track AF, which is supposed blocked at both ends, asshown in the diagram. In the model, the track AF is 9 incheslong, AB =…
Geometry · Cryptography · Ciphers
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