Turpentine from Waste Wood

A Line of Industry Which has Proved Baffling to Inventors

Copper Mirrors

Asbestos

Its Production uses, and cost

About Meerschaum

The Spark Method for Grading Steels

A Consideration of the Application of Tests for Steel Bars

Elements of Electrical Engineering.—I

The Electric Circuit-Electromagnetic Induction—The Magnetic Circuit

Automatic Speed Control for Magneto

Potassium Chloroplatinite for Photographic Use

The Commercial uses of Fluorspar

Note on the Gridiron Pendulum

Recent Progress in Astronomy

Advances Made in Establishing an Autobiography of the Heavens

The Kafue River Bridge on the Cape to Cairo Railroad

The Longest in Africa by the English Correspondent of the Scientific American

The Development of armored War Vessels.-V

Armor Plating in the United States

Cause of Vitiation of Confined Air

How Ill Effects are Modified by Constant Ventilation

Late Egyptian Excavation

Trade Notes and formulæ

Engineering Notes