http://www.nlm.nih.gov/hmd/chineseposters/index.html

The ear is like a telephone and the eye is like a camera.1933.

“This online exhibition was created from Dr. Liping Bu’s presentation, titled “Public Health and Chinese Society from 1930s to SARS,” at Seminar in the History of Medicine, National Library of Medicine, August 15, 2006. Dr. Bu is professor of history at Alma College and is working on a book about Public Health and Modernization of China.”

Click here:
http://www.nlm.nih.gov/hmd/chineseposters/images/1200/DSC_4004.jpg
for a larger image.