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Fig. 2. Photographs of the machine. (A) The machine in working configuration,
screen lowered. w, one of two wheels preventing the sphere from rotation about
the vertical axis. (In the lower left corner the small sister of the 50 cm
sphere can be seen, designed for insect work.) (B) Machine with screen lifted.
b, DDV 1800 (Liesegang) beamer; c, two small video `finger' cameras to control
the rat's behaviour within the screen; md, motion detector. In the background
the air support tube and the crank handle to lift and lower the screen are
visible. The photo is a portrait of the late Sigmund Exner, 1846–1926
(physiologist at Vienna). (C) The optics in more detail. aam, angular
amplification mirror; p, two plane mirrors. The beamer and its shielded output
is seen on top. (D) The haltering of the rat. aie, angular incremental
encoder. The light gray leather harness attached to aluminum sheets with axial
joints is seen. The thin brass tube ending at the rat's mouth is always
rotated with the haltering and delivers sugar water drops via a
PC-controlled valve. For details, see text.
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