Reverse irrigation of rice fields, China, ca.1900-1919

"Reverse irrigation. Pedaled all day to get water from 1 field to another."; Captions for this set of lantern slides from the papers of Oliver and Jennie Logan, American Presbyterian missionaries in Hunan, were provided by their daughter Elsa.反向灌溉（Reverse irrigation）：终日踩踏抽水机具，将水从一块农田输送至另一块农田。这套幻灯片（lantern slides）的解说文字，源自美国驻湖南长老会传教士奥利弗与珍妮·洛根的文稿，由他们的女儿埃尔莎提供。