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Features

The Charlottenburg Polytechnic School's Laboratory for the Testing of Materials

By L. Ramakers

A British Opinion Concerning Power Gas

Economies of Mechanical Draft

The use of Boiler Compounds

By William M. Booth

Can a Steam Turbine be Started Quicker than a Reciprocating Engine?

By A. S. Mann

Tea-Making Machinery

Preparation and Compression of Pure Gases for Experimental Work

By R. S. Hutton and J. E. Petavel

Diamonds and the Diamond Industry

A Novel Floating Exposition

The Sense of Smell in Ants

By Adele M. Fielde

Rhythmic Movements of the Sea

By A. Berget

The Beginnings of Counting

By Levi Leonard Conant

Clay Products of the United States During 1904

Stroboscopic Observations of Alternating Current Arcs

Some Notes on Nickel-Iron and, Lead Storage Batteries and Accumulator Traction

Solar and Terrestrial Changes

The Production of Bromine in 1904

Beginning of the New North Polar Cap of Mars

Contemporary Electrical Science

Science Notes

Electrical Notes

Trade Notes and Recipes

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