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Profits of Railroads

A False Island

Ison's Improvements in Machinery for Making Spikes and Nails

Tunnel through the Green Mountains

Coal Fields of Pennsylvania

Special Correspondence of the Scientific American

Custom House Scrutiny in Liverpool

Electro-Magnetism as a Moving Power

Hibbard's Patent Process of Tanning

Roofing the Britannia Tubular Bridge

Currents of the Ocean—Pendulum Experiments

Improved Machine for Punching Leather Hose, Harness, & c

Libbey's Leather Car for raising Hides from Vats

Improved Railroad Brake

New Rate of Postage—Important Information for the Subscribers of the Scientific American

Patent Case—Carpet Loom

Great Improvement in the Piano Forte—Piano, Flute, and Viol all Combined

Improved Oil Cup

Improvement in Shuttles

Pennsylvania Chrome Mines

Cast Iron Buildings—Crystal Palace

Errors in Printing

The Recognition of Genius and the Industrial Principle

Practical Remarks on Illuminating Gas

List of Patent Claims

Post Office Stamps

Mechanics

Inventors and Manufacturers

Horse Shoeing

St. Domingo Antiquities

Floating of Rafts on Rivers

Hydraulics

Receipts for Cholera

A New Remedy for the Scurvy

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June 28, 1851

See the World from a Different Perspective

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