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Features

The Various Types of Gas Lamp

Their Comparative Practical Efficlency

By R. C. Ware

New Solvent for India Rubber

Apparatus for Aerial Photography

Bellini-Tosi System

A Method of Directing Hertzian Waves

A Novel Railway Ticket Printer

A Machine which does away with Large Stocks of Tickets

The Mortality Rate in Dusty Trades

Some useful Lessons of Limewater

A Few Chemical Facts for the Engineer

By Charles S. Palmer

Sense of Smell in Flies

By Alex. Hill

A New Method of Housekeeping

The Fick Apartment House of Copenhagen

An Automatic Gate for Crossings

A Device that Takes the Place of Hand-Operated Gates

Watercress Culture in France

A Picturesque Industry

By Jacques Boyer

Fire-Resisting Building Materials

A Study of their Qualities

Curious Properties of Numbers

The Coal-Tar Dye Industry

Its Wonderful Rise and its Importance

The German Military “Zeppelin I.”

Detailed Description of the Remodeled Third Airship of Count Von Zeppelin

By Ansbert Vorreites

The Yielding of the Earth to Disturbing Forces

The Status of the Water-Tube Boiler

A Review of its Various Forms

Engineering Notes

Trade Notes and Formulæ

Science Notes

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June 12, 1909

Confronting Common Wisdom