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Double-Deck Subway Express Stations

Safety of the Brooklyn Bridge

Safety Devices on Railroads

Heroic Measures in Hudson Tunnel Construction

Healthy Conditions at Panama in 1907

The Aviation Section of the Aero Club of America

Second Exhibition of Safety Devices

New York's Automobile Carnival and Hill Climb

Facts about the Use of the Air Brake

By L. F. Wilson

The Current Supplement

The Latest Development in British Railway Locomotive Design

By F. C. Coleman

Weather Vane with Attachment for Indoor Readings

By William H. Place

A Machine that Saws 240,000 Wooden Paving Blocks in a Day

By Jacques Boyer

Is the Axis of the Earth Shifting?

By J. F. Springer

The United States Battleships "Delaware" and "North Dakota"

Successful Test of the Cornu Helicopter

Puck's Conception of the Scientific American

Thill Coupling

Revolving Flash Lamp

Pneumatic Valve Mechanism for Piano Players

Patent Department

Tobacco Hanger

A Machine for Vending Postage Stamps

A New Type of Automobile Horn

Frying Pan with Folding Handle


  • Departments


  • Recently Patented Inventions

  • Notes and Queries

  • Index of Inventions

  • New Books, Etc.

  • Patents

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April 18, 1908