Trude Engelhart, ca. 1928

Atelier Robertson (1927–1933) :: Dancer Trude Engelhart. From a group of four dance studies (Niddy Impekoven, Ellinor Bahrdt, Trude Engelhart and Ira Langenteels), ca. 1928. Each with the photographer’s studio stamp and handwritten annotations in pencil on the reverse. | src Ostlicht (Westlich) Photo Auction nº 14 (June, 2016) | hi-res here

Movement study by Koppitz

Rudolf Koppitz (1884-1936) ~ Movement Study (Variation), 1925. Bromoil print | src Photoinstitut Bonartes via LL/51132
Rudolf Koppitz (1884-1936) ~ Motion study, 1925. Bromoil print. Photoinstitut Bonartes | src getty images