SCIENTIFIC AMERICAN, May 1, 1869 The most collectible content is "MONOD'S IMPROVED BICYCLE BRAKE", which includes related illustrations. Also present are illustrations and details related to:  "...STEAM BOILER", a non-explosive Kerosene lamp, and more. See images for details.
Complete in 16 pages, a slight mid-fold, minor edge tear in the upper margin region of each page which have been archivally mended, but in overall good condition.