Features
The War
Sigourney's Projectile
Inventors the Prosperous Class
Experiments with McCarty's Centrifugal Gun
James' Rifled Cannon—In What It Consists
Steel Clad Steam Chariots of War
The Beginning
Electrical Spirit Rappers—Interesting Development
Recent American Inventions
New Odorless Burning Fluid
United States Navy Yard
Patent Claims - July 6, 1861
To Our Readers
Departments
- Letters
Correspondence - July 6, 1861
- Departments
Notes and Queries - July 6, 1861
