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The Making of a Cold-Drawn Steel Tube

A Description of the Shelby Process

Wireless Telegraphy in Navigation

The Principles of the Lair Process

Census Statistics of the Street Railway Industry

Universal Camera Bracket

How to Photograph Objects Laid on a Floor

By Ethan Viall

The Absorption of X-Rays

A Brief History of the Double Bass

The Development of the Largest of Stringed Musical Instruments

By Giuseppe Maria Marangoni

Why Steel Rails Break

Thermophile Life

Chemical Affinity

Its Relation to Electrical Attraction

By Oliver Lodge

Increasing the Soil's Nitrogen Content

The Bottomley Seed and Soil Nitrogen Bacteria for Leguminous Crops

Some Cosmical Aspects of Radioactivity

The Distribution of Radioactive Matter

By E. Rutherford

Some Roman Building Materials

By Nicholas Knight

The Flight of Birds.—I

The Mechanics of a Bird'S Way in the Air

By F. W. Lanchester

Some Common Disinfectants

By M. Dorset

Engineering Notes

Trade Notes and Formulæ

Electrical Notes


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