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SA Supplements Vol 54 Issue 1401supp

SA Supplements

Volume 54, Issue 1401supp

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Features

The Underground and Elevated Electric Railway in Berlin—Now Completed and in Operation

Frank C. Perkins

Russian and American Petroleum

New Process for Ore Concentration

The Block System

Recent Progress in Large Gas Engines

Researches on Argon and its Combinations

M. Berthelet

A Power Milk Separator

Report of Bureau of Steam Engineering on Liquid Fuel for Naval Purposes

Restorative Power

Post Office Statistics

Apparatus for Short-Distance Stereoscopic Photography

The French First-Class Battleship “Gaulois.”

Failure of Volapuk

Some Practical Suggestions on Mosquito Extermination in New Jersey

Henry Clay Weeks

Reclaiming Swamps

The Forests of Russia

The Lorenz Operation

Cotton Seed Rendered Immune

Distribution of Current at the Surface of Cathodes in Vacuum Tubes

A. Wehnelt

South African Coal Fields

What the United States of America is doing for Anthropology

Trade Suggestions from United States Consuls

Selected Formulæ

Patents!

Trade Notes and Recipes