Hermann Wilhelm Leopold Ludwig Wissmann (1853–1905) was a German explorer and administrator in Africa, who traveled through the Congo River basin in the Central Interior. After, Wissmann served King Leopold II of Belgium and aided in the process of creating the Congo Free State.
Hermann von Wissman, My Second Journey through Equatorial Africa from the Congo to the Zambesi in the years 1886 and 1887. Translated from the German (London, 1891), facing p. 246.
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"Feeding Slaves", Slavery Images: A Visual Record of the African Slave Trade and Slave Life in the Early African Diaspora, accessed February 27, 2020, http://www.slaveryimages.org/s/slaveryimages/item/416