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Features

Canal of Isabella II, at Madrid

The “Dogwoods” Used in the Manufacture of Gunpowder in England

Condensed from a Paper in "The Student"

By John B. Jackson

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

By F. A. P Barnard

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.

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