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Ozone in Ventilation

An Exposition of Faulty Methods of Investigation Heretofore Employed

By J. C. Olsen and Wm. H. Ulrich

Report of the Bureau of Mines

The Diary of Kilauea

Volcanic Action in Hawaii Being Observed and Recorded

Food for Polar Explorers

The Largest Centrifugal Pump

Maps and Map Making

An Historical Review of the Development of the Art of Topography

By Thomas H. Holdich

Where Timber is Wasted

Astronomy in the Arctic

Some of the Duties and Hardships of Observers in the Frigid North

By Russell W. Porter

To Cuba by Rail

The Last Link Between Key West and Havana Joined

By Harry Chapin Plummer

Electrolytic Silver-Cleaning Method

Apparatus for Demonstrating Newton's Laws

Studying Motion Accelerated Under the Action of a Constant Force

By H. W. Harmon

Sudden Changes in the Form of Liquid Crystals

By O. Lehmann

Forest Fire Prevention

A Dog-Proof Fence

Recent Advances in Photography

Some Effects Produced on Sensitive Plates by Material Emanations

By Henry Leffmann

Health Requirements for the Aeronaut

“Suction” between Passing Ships—II

Important But Little Understood Forces Affecting the Motion of Vessels

By A. Reeve

Correspondence

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    January 16, 1915

    Think Outside the Gift Box