Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 527
Fig. 247. until he has actually measured the distances. A still more striking exampleof the same kind of illusion is shown by Fig. 248, due to ZoUner. Thisappears a sort of pattern, in which the broad bands are not upright, butsloping alternately to the right and left, and with the spaces between…
Inventions
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