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Features

Improved Portable Steam Brick Machine, Work for Women

Terrestrial Magnetism

The Manufacture of Sulphuric Acid

Ault's Improved Candle Holder and Grease Cup

Winkelhouse's Improved Bit Holder

Aerial Navigation

On the Nature of the Aurora Borealis

By Vander Weyde

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

Stevens' Patent Hand Vise

The Protection of Property

The Rational Construction of Hospitals

Report of the Regents of the Smithsonian Institute

Solar Spots

The Crack of Doom

The Extension of Patents

On Experiments with Dynamite

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

Manufacturing, Mining, and Railroad Items

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

Obituary.—George Peabody

The Highest Prize Awarded at the American Institute

Wood-Paper Manufacturing Case

Recent American and Foreign Patents

H. S. Patent Office

New Publications

Official List of Patents

Answers to Correspondents

Applications for Extension of Patents

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Why Do Facts Fail?

Why Do Facts Fail?

Deconstructing Denial