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Taylor's American Field Piece

The Broadway Underground Railway

The Sources of Our Modern Knowledge

The Fire on Board the Steamer Alaska

Estimating Power by Size and Speed of Belts

Zirconium

The Hydraulic Ram

Patent Medicines

Novel Rat Trap

A Novel Mode of Marine Propulsion

The Configuration and Dimensions of Blast Furnaces

The Wonders of the Egg

American Locomotives--The Baldwin Works

Cart Loader

Culinary Boiler

Combination Padlock

Central Park, New York City

Recent American and Foreign Patents

Answers to Correspondents

Best Mode of Introducing New Inventions

Communications Received

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April 26, 1873

See the World from a Different Perspective

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