《Scientific American Supplement, No. 484, April 11, 1885》 - 免费有声读物

The Scientific American may be the oldest continuously published periodical in the United States, having launched its first publication in 1845. It has been a mainstay of popular science with in-depth articles across a broad spectrum of scientific fields. In this supplement are short articles ranging through such topics as Torpedo Ships, The Gas Engine, Capstan Navigation on the Volga, Astronomical Photography, and Sanitary Cooking. - Summary by Larry Wilson