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 <link ref="tec2990">same device</link> on another photograph from this set. 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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