Volume 6, Issue 18
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Features
Notes on Military and Naval Affairs
Polytechnic Association of the American Institute
The Discoveries of 1861
Mayberry's Cartridge
Testing the Strength of Electrical Currents
Photographing from Balloons in Military Reconnoissances
Philosophy of Projectiles
Manufacture of Armor Plates--Hammered and Rolled
Large European Guns and Powder
The Rifle
The British Parliament on the Fight in Hampton Roads
Original Experiments with Superheated Steam
Recent American Inventions
Patent Claims
Issued from the United States Patent Office