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Features

The Manufacture of a Pneumatic Tire

Modern Explosives

Motor Vehicles for Heavy Traffic

Apparatus for Filtering Air and Smoke

Selected Formulæ

Actinium: A New Radio-Active Element

By A. Debierne

Trade Notes and Receipts

Trade Suggestions from United States Consuls

A Universal Boring and Tapping Machine

Rails

Paints and Varnishes

By A. H. Sabin

Lister's Inclinometer Theodolite

Bubonic Plague in the Bible

Grindelia Patens

Mason Bees

Hypnotism in Medicine

The Gold Deposits of Cape Nome

By Charles G. Yale

Apparatus for Lighting and Extinguishing Gas from a Distance

New Books

Specific Gravity of the Human Body

By John C Packard

Patents!

Practical Conditions in the Application of Green Manures

Departments

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