Scientific American, Vol. 21, No. 4 (July 1869)

1869 · 5 pictures

Patents · Iron · Zirconia · Velocity · Steel · Steel rails · Water · Tensile strength · Scientific American · Railway car · Wrought iron · Antedated june · Water wheels · Patent office · Cast Iron · Heated air

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