Scientific American, Vol. 30, No. 20 (May 1874)

1874 · 10 pictures

Patents · Improved · Screw · Sewing · Iron · Sewing machine · April · Cast Iron · Strain diagram · Horse power · Three times · Scientific American · Tbe best · Wrought iron · Freight cars · Steam engine

Internet Archive · Public domain (published before 1931) · More from this library