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A Proposed System of Electrically Towing Canal Boats

The Automatons of Jaquet-Droz, Father and Son

Motors in Agriculture

By the London Correspondent of the Scientific American

Contemporary Electrical Science

Refining Gold by Electrolysis

Electric Generator for Lighting Residence

How to make Soap Powder

The Orient Pacific Liner “Orontes”

Notes on the Contact Process of Making Sulphuric Acid

History of Finger Rings

By Cyril Davenport

Is the Effect of Radio-Active Substances an Absorption of Gravitational Energy?

On Polonium

By F. Giesel

Latest and Best Value of the Mechanical Equivalent of Heat

Carl Hering

The Evolution of the Pianoforte

By Randolph I. Geare

Man's Place in the Universe

By E. Walter Maunder

Kites as Meteorological Instruments

The Meteor of the Soudan

The Clay-Working Industries of Greece

Results of a Naval Inquiry as to which is the Most Powerful Armorclad Afloat

Libbey's Travels in Ancient Syria

Trade Notes and Recipes

The Berber Tribes of North Africa

The “All Stations Express”

Trade Suggestions from United States Consuls


Selected Formulæ


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    April 18, 1903

    20% Sitewide for President's Day