SCIENTIFIC AMERICAN, New York, May 13, 1865  The front page has a nice print of: "Derrom's System  For Trestle Bridges" with a related article titled: "Improved System for Trestle Bridges" It begins: "The transit of streams in military operations is often one of the most embarrassing incidents of a campaign...During the whole of the present war & up to the ignominious flight of the rebel leaders from their capital, bridges he always been destroyed where practicable...".
The print shows a military unit crossing one of the bridges.
Inside has two prints of: "Roberts's Breech-Loading Rifle" with a descriptive article.
Sixteen pages, nice condition.