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Lewistown Suspension Bridge

Shell Banks in Ohio

Stopping Trains by Electricity

Tehuantepec Survey

Newman's Patent Excavating Machinery

Rio Grande Survey

Gilding Solution

Probable Detention of Two Americans in Paraguay

Bermuda Corals

Currents of the Ocean

Discovery of Another Mammoth Cave in Indiana

Improvement for Working Butter

Wheeling Bridge Case

Bee Hives

Forms of Matter

Chemistry of Madder

Poisoned by Eating a Worm

Beautiful Varnish

The Voltaic Battery—Electrotype

Improvements in Printing


Copying Electric Telegraph

Improvements in Gate Hinges

Newly Invented Gas Light—New Source of Heat and Motive Power

Novel Boiler Feeder

The Planet Saturn


Mechanical Drawing

Testing Iron Girders

Broom Machinery

Change in the Post-Office

Form of the Least Resistance

Great Exhibition—English Patent Laws

Growth of the Human Nails

The Importance of Correct Patent Specifications

City Railroads

Electric Lights Again

List of Patent Claims

Pulverized Wood for Cattle

The Steam Engine

Articles from Jerusalem to the World's Fair

Standing Notice to Subscribers


Improvements in the Manufacture of Flax in Ireland

To Render Cloth Incombustible

Poison Sausages

New Explosive Substance


Inventors and Manufacturers

To Take a Plaster of Paris Cast from a Living Face


  • From the Editor

    To Correspondents

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December 21, 1850