Large color-mixer, with horizontal rotating disks, connected with foot-machine / Apparatus for color-sense of the eccentric parts of retina, to be attached to Hering's foot-machine. After Hering, by Rothe, Prag See the same device <link ref="tec2990">on another photograph</link> from this set. Large color-mixer, with horizontal rotating disks, connected with foot-machine / Apparatus for color-sense of the eccentric parts of retina, to be attached to Hering's foot-machine. After Hering, by Rothe, Prag
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