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The Langley Aerodrome


Contemporary Electrical Science

Oil Burning with Induced Draught

An Automatic Postage Stamp and Postal Card Distributor

The “Phenix” Accumulator

Distribution of Light from the Nernst Lamp

Electrically-Driven Well-Pump

The Utilization of Wastes and By-Products in Manufactures

With Special Reference to the Decade of 1890-1900

By Henry G. Kittredge

Notes on some Experimental Researches on Internal Flow in Centrifugal Pumps and Allied Machines


By James Alex Smith

The Contact Process for the Manufacture of Sulphuric Acid

The Figure of the Earth

Animal Thermostat

New Apparatus for Sterilizing Water

How to Remove the Inner Tube of a Double-Tube Automobile Tire

Compensation for the Weakening of Permanent Magnets

Science and Literature

Trade Notes and Recipes

Trade Suggestions from United States Consuls

Selected Formulæ



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