Comparison of Steam and Producer-Gas Marine Plants

To Keep the Peace

Station Announcers on Trains

Defense Against Dirigibles

Aeronautics

Science

Engineering

The New Knippels Bridge at Copenhagen

By our English Correspondent

Fluid Compression of Steel Ingots

The New United States Battleship "Mississippi"

The Manufacture of French Postage Stamps

Some More Lunar Superstitions

Slipping of Wheels on Curves

Signaling to Mars with Mirrors

Can-Filling Machine

Self-Cleaning Brush

Poultry-Picking Machine

Patent Department