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Features

Design for the Tower Bridge

Machine Guns at the Inventions Exhibition

The Steamer Pittsburg

Ocean Lightships with Captive Balloons

Compressed Air Locomotives

The Oerlikon Roller Grinding and Grooving Machine

New Secondary Battery

Warmth, Coldness, and Pressure

New Thermodynamics

Fire-Proof Building in New York

The Marble Panels of the forum Romanum

Frescoes Found in Rome

The Bower-Barff “Rustless Iron”

By J. H. Kidder

The Method of Making Soap—Laundry and Toilet—With Formulas

By an Experienced Manufacturer

Anderson's Water-Purifying Apparatus-Inventions Exhibition

Psychography

On the Organization of the Tribe

By J. W. Powell

A Colossal Cotton Tree

The Ways of Monkeys

By Alfred E. Brehm

Camphor Barometer, or “Storm Glass”

Causes of Sex

Regulation of Sex Proportion in Animals and Plants

The Glycerine Barometer

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    June 20, 1885

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