Volume 50, Issue 3
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Features
The Nullification of the Patent Laws
Restoration of American Shipbuilding
Working Cold Wrought Iron
Magnetism in Cities
A Blow at the Industries of Indiana
Blotter
Process of and Apparatus for Blocking Ice
Engine Lubricator
Improved Double Mould Board Plow
Hose Reel
The Strength of Lead Pipes
Soemmering's Electric Telegraph
The Chimpanzee and Koolokamba
Nut Lock
Mechanical Inventions - January 19, 1884
Miscellaneous Inventions - January 19, 1884
Engineering Inventions - January 19, 1884
Insurance - January 19, 1884
Aetna Insurance Company of Hartford