Figure 2

(A) Sketch of the laboratory experiment. Channel is 1 m in diameter and 25 cm wide. (B) Picture of the flat pushing blade in channel, taken by camera moving with blade. Black spot on top is a microphone (also rotating). Circles on blade, separated by 1 cm, allow direct measurement of height of pushed mass during motion (image and text: Phys. Rev. Lett. 97 018002)

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