Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 91
70 GEOMETRICAL RECREATIONS [CH. IV an engine runs up one siding, such as DBA, it must come back the same way. Initially a small block of wood, P, coloured to represent a wagon, is placed at B; a similar block, Q, is placed at C; and a longer block of wood, R, representing an engine, is placed at E.… … Another shunting puzzle, on sale in the streets in 1905, under the name of the “Chifu-Chemulpo Puzzle,” is made as follows. A loop-line BGE connects two points B and £ on a railway track AF, which is supposed blocked at both ends, as shown in the diagram. In the model, the track AF’ is 9 inches…
