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The Congo Railroad

High Explosives and Smokeless Powders and their Applications in Warfare

By Hudson Maxim

Notes on Repairs to Gas and Oil Engines

Two-Spindle Vertical Milling Machine

A New Rotary Steam Engine

Friction Clutches

Sand Blast for Cleaning Walls

Utilization of Indian Corn Stalks in Russia

The Value of Photographic Residues

Cutting Waste Negatives for Cover Glass

By R. P. C.

Prehistoric Weaving in England

The Mines of Ethiopia

Miscellaneous Notes

Selected Formulæ

Engineering Notes

Bull Fighting

Wages and Prices in America

The Need of College Men

Feat of an Indian Fakir

Fortuitous Discovery

Arrangement of an Electro-Plating Plant

A New Electric Sewing Machine

An Aluminum Conductor

Experiment Upon Inertia

The Dicaiometer

Roman Villas

The Liver

The Significance of the Garment

By Alice C. Fletcher

Drinking Water at Camp Thomas

Liquid Air

Stanhopea Madouxiana


The World's Copper Production and Consumption


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