Scientific American, Vol. 40, No. 20 (May 1879)

1879 · 7 pictures

Patents · Patented · Iron · Scientific American · Machinery · Subterranean telegraph · Trade catalogs · Intermolecular etheric · Compressed air · Patent office · Wrought iron · Cubic yards · Etheric substance · Patent laws

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