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Features

Elimination of Friction in Ball Bearings

Importance of this Question in View of the Application of Such Bearings in Heavy Work Sources Of Friction Analyzed.

By J. F. Springer

The Action of Steam in Cylinders

Elements of Electrical Engineering.—Viii

Principles of Direct-Current Motors

By A. E. Watson

Rail Testing on the Pennsylvania Railroad

The Mastery of the Ocean

The Size of Ocean Waves

A Gigantic Plane

The Biggest Machine of its Rind ever Made

The Problem of the Metalliferous Veins

A Geological Question

By James Furman Kemp

The King's Druggist

The Game of Diabolo

How it was Played Four Hundred Years Ago

By Henri D*amp*apos;allemagne

Production of Gold and Silver in the United States in 1906

The Origin of Bacteria from Algæ

The Remarkable Theory of Prof Dunbar

By C. Lauenstein

The Geology of the Klondike

Genesis of the Formation of Gold in the Placer Gravels in the Klondike-Yukon Mining Region Geography of the Klondike Region Mining of Gold Placer Gravels in Klondike-Yukon Valley by Dredgers Cost of Extracting Gold...

By Willis Eugene Everette

A Flying Machine for the Army

Trade Notes and Formulæ

Engineering Notes

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