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The Milestones of Human Progress

The Queen Regent and Alfonzo XIII

Tombs of the First Egyptian Dynasty

By Ludwig Borchardt

Rose Psyche

Sleep and the Theories of its Cause

The Reclaiming of old Rubber

By Hawthorne Hill

Amateur Chronophotographic Apparatus

Electrical Notes

Engineering Notes

Selected Formulæ

Wild and Domestic Sheep in the Berlin Zoological Garden

The Development of the Central Station

By Samuel Insull

The American “Regular”

By the English Correspondent of the London Times on Board the United States Transport “Gussie”

The Lock of the Dortmund-Ems Canal at Henrichenburg

Steering Gear of North German Lloyd Steamers “Coblentz,” “Mainz,” and “Trier.”


Combined Steam Pumping and Motive Power Engine


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