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Features

Improved Portable Steam Brick Machine, Work for Women

Terrestrial Magnetism

The Manufacture of Sulphuric Acid

Aerial Navigation

Ault's Improved Candle Holder and Grease Cup

Winkelhouse's Improved Bit Holder

On the Nature of the Aurora Borealis

By Vander Weyde

Stevens' Patent Hand Vise

Massey's Patent Low Water Detector and Gage Cock Combined, and High and Low Water Detector

Report of the Regents of the Smithsonian Institute

The Protection of Property

Solar Spots

The Rational Construction of Hospitals

The Nottingham Knitting Machine, and Gadd & Moore's Improved One Shaft Loom

On Experiments with Dynamite

The Crack of Doom

The Extension of Patents

Wood-Paper Manufacturing Case

The Highest Prize Awarded at the American Institute

Obituary.—George Peabody

Manufacturing, Mining, and Railroad Items

Report of the Cooper Union for the Advancement of Science and Art

H. S. Patent Office

Recent American and Foreign Patents

Answers to Correspondents

New Publications

Official List of Patents

Applications for Extension of Patents

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Science or SciFi?

Science or SciFi?

Vanishing Particles. Spooky Action.