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Turpentine from Waste Wood

A Line of Industry Which has Proved Baffling to Inventors

By J. E. Teeple

Copper Mirrors

By F. D. Chattaway

Asbestos

Its Production uses, and cost

By J. S. Diller

About Meerschaum

The Spark Method for Grading Steels

A Consideration of the Application of Tests for Steel Bars

By Albert F. Shore

Elements of Electrical Engineering.—I

The Electric Circuit-Electromagnetic Induction—The Magnetic Circuit

By A. E. Watson

Automatic Speed Control for Magneto

Potassium Chloroplatinite for Photographic Use

By Rudolph Bolling

The Commercial uses of Fluorspar

By Ernest F. Burchard

Note on the Gridiron Pendulum

By C. F. Adams

Recent Progress in Astronomy

Advances Made in Establishing an Autobiography of the Heavens

By Klein

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

By J. H. Morrison

Cause of Vitiation of Confined Air

How Ill Effects are Modified by Constant Ventilation

By Alfred Gradenwitz

Late Egyptian Excavation

By A. M. Lythgoe

Trade Notes and formulæ

Engineering Notes

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September 28, 1907

Beyond XX and XY

Biology. Identity. Equality.