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The Krupp Works at Essen.—I

By Day Allen Willey

Some Properties of the Radiation of Radio-Active Bodies

Reflections on Telepathy

By John Trowbridge

The Conundrums of Radium

The Development of Marconi's System of Wireless Telegraphy

By Emile Guarini

Contemporary Electrical Science

Color Photography

Henequen—The Sisal Fiber of Yucatan

By E. H. Thompson

Report on a Visit to America

By H. A. Yorke

A New Process for Making Briquettes

Concrete Floors and Walks

Launch of the Argentine Cruiser “Moreno”

By Charles De Grave Sells

The Duke Du Bourg De Bozas' Expedition to the Land of the Blue Nile

The Danvin Dust Collector

The Planimeter, Explained simply, without Mathematics

By W. J. Tennant

The Latest Researches on the Discovery of America by the Northmen

By A. Gehlen

Trade Suggestions from United States Consuls

Two Recent Visits to the Forbidden City of Lhasa

Patents!

Trade Notes and Recipes

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    May 09, 1903

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