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The New International Carat of Two Hundred Milligrammes—I

A Movement for Uniformity in Jewelers' Weights

By George Frederick Kunz

Welding Repairs to Boilers

The Manufacture of Balls for Bearings

Each Ball is Made True to Within One Ten-thousandth of an Inch

By Thomas J. Heller

The Waterproofing of Textile Fabrics

By the Use of Aluminium Salts and of Bichromate-gelatine

By J. Blair

The Optical Activity of Petroleum and its Significance

New Light on the Nature and Origin of Mineral Oil

By F. W. Bushong

The Exposition of Architecture and Building

Leipzig, Noted for its University and as a Publishing Centre, Chosen for the Site

The Luminosity of Animals

Animal Growths in Water Pipes

The Troubles Which They Cause, and Methods of Coping With Them

By Samuel C. Chapman

Smallest Lung Capacity Compatible with Life

Spiders and their Habits

A Ferocious Tribe Allied to the Insects By Our Berlin Correspondent

On Safety of Life at Sea

The Loss of Life Amounts to Less Than One in a Hundred Thousand Passengers

By Percy A. Hillhouse

Boronized Copper

A New Factor in Metal Failures

By Ernest A. Lewis

A New Method of Boiler Cleaning


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