Features
The “Dogwoods” Used in the Manufacture of Gunpowder in England
Condensed from a Paper in "The Student"
The Tidal Wave
The Manufacture of Sulphuric Acid
Improvement in Frames for Spectacles and Eye Glasses
Aerial Navigation
The Velocimeter–A New Aid in Mechanics
Inflammable Gas-Engines
Implement for Sharpening Knives
Boiler Explosions
What is to Become of Our Brown-Stone Fronts?
Mica Brocades–a New Product of Art
Is There Such a Thing as Social Science?
The Care of House-Plants
Polar Expeditions
Editorial Summary
Horsford's Phosphatic Bread
H. S. Patent Office
Answers to Correspondents
Manufacturing, Mining, and Railroad Items
Recent American and Foreign Patents
Official List of Patents
Issued by the United States Patent Office.
Departments
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Correspondence
Business and Personal
