SCIENTIFIC AMERICAN, New York, May 14, 1870  The front cover has "Ames' Portable Engine for Agricultural Use" with an accompanying article. Inside the issue is: "Improvements in Welding Metal Plates"; "Obituary - Zerah Colburn, Engineer, and Leading Writer of Engineering Papers"; "Geer's Improved Cherry Stoner"; and more articles, illustrations and advertisements.
Complete in sixteen pages, lite scattered staining throughout, otherwise in good condition. Never bound.