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The Chemistry of Cellulose

A Substance Little Understood

By Carl G. Schwalbe

Additional Points about the New Paris Subway

Modern German Police Call and Fire Alarm Systems

Some Recent German Designs

By Frank C. Perkins

Value of Illuminatinǵ Enǵineerinǵ to the Manufacturer

A New Art and Its Possibilities

By V. R. Lansin*amp*gacute;h

Rules Governing the Competition for the $15,000 Flying Machine Prize Offered by Mr. Edwin Gould

A Spanish Mininǵ Concrete Pier

A Remarhable Cement Structure at Guadalquivir

By Frank C. Perkins

Blue-Printinǵ by Machinery

A Collection of Interesting Contrivances

By Geor*amp*gacute;e J. Jones

An Appreciation of Thomas Davenport

A Pioneer in Electrical Engineering

By T. Commerford Martin

Maǵnetic Alloys

A New and Important Field of Investigation

By H. A. Knowlton

New Methods in Astronomy

Their Application to the Evolution of Our System

By F. W. Henkel.

The Determination of Standard Time

How the Astronomer Sets Your Watch for You

By C. H. Gin*amp*gacute;rich

Precautions in the Use of Explosives

Index of Inventions


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