《Scientific American Supplement, No. 601, July 9, 1887》 - 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 boats, engineering updates, sponges, and a long article on bricks and brickwork, and much more. - Summary by Larry Wilson