Gardner's Pocket-Knife

Improved Carbine

Fairbairn on Steam Boiler

Some Effects of Magnetism Illustrated

Miscellaneous Summary

Improvement in the Bessemer Process

Breech-Loading Repeating Rifles

Irregular Action of Gunpowder

Mechanical Inspirations

Not in Anger

Cast-Iron Boilers

Insecurity of Life in English Cars

One Thing to Make For the Sanitary Commission

The Defense of New York Harbor

The Hecker and Waterman Experiments

Perfumery

To Our Readers

Special Notices

Patent Claims

Issued From the United States Patent-Office for the Week Ending July 26, 1864

Photographic Items