Caption:
Rudolph Dührkoop, Dr. phil. August Voller, Professor, Director of the State Laboratory of Physics from the portfolio Hamburgische Männer und Frauen am Anfang des XX. Jahrhunderts, Staatliche Landesbildstelle Hamburg, collection on the history of photography, paper, heliogravure, image size: height: 21,40 cm; width: 15,00 cm, signed: recto below the image: imprinted signature of the sitter, inscribed: recto: engraved on printing plate, below the image: photograph and photogravure R. Dührkoop, Hamburg, top left above picture 27; bottom right in the corner noted in lead: 122, stamp: recto: handwritten addition: Inv.Nr. and reference to repro, portrait photography, half-length portrait, laboratory, physics and mechanics, historical person, Carl August Voller, part of the portfolio Hamburgische Männer und Frauen am Anfang des XX. Jahrhunderts - Kamera Bildnisse - Photographed, etched in copper and printed by Rudolph Dührkoop Hamburg 1905.