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Features

Improved Tele-Photography

By Alfred Gradenwitz

Hydrocarbon Oils and their Value as Lubricants, with a Few Practical Tests

Production of Oxygen and Oxygen Light

Soluble Ferments

By J. H. Long

The Testing of Photographic Dry Plates

By C. E. Kenneth Mees

High Speed on Steam and Electric Railways

By Robert H. Smith

Production of Salt in 1904

Diatoms, the Jewels of the Plant World

By Albert Mann

Discoveries at Ephesus

Experiments in Destroying Black-Flies

By Clarence M. Weed

An Automatic Cask-Recording Machine

By The English Correspondent Of Scientific American

Submarine Signals

By William H. White

The First Producer-Gas Boat

Diamonds

Washing and Concentrating Machinery

By William Crookes

Engineering Notes

Science Notes

Trade Notes and Recipes

Departments

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September 30, 1905

Think Outside the Gift Box