Horopter—or optical demonstration device—with a “WILH. PETZOLD / LEIPZIG” inscription.
Ref: Wilhelm Petzold, Preis-Verzeichniss der Werkstätte für Präcisions-Mechanik von Wilh. Petzold: Abtheilung der Instrumente und Apparate für physiologische Experimente und Vivisectionen (1891), p. 41.
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