image license
# worker
![](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Otto_Lilienthal_gliding_experiment_ppmsca.02546.jpg/640px-Otto_Lilienthal_gliding_experiment_ppmsca.02546.jpg)
+
+[from](https://commons.wikimedia.org/wiki/File:Otto_Lilienthal_gliding_experiment_ppmsca.02546.jpg) the [United States Library of Congress's](https://www.loc.gov/) [Prints and Photographs division](https://www.loc.gov/rr/print/)
