The Making of Aeroplane History

Improved Rails by the Dry-Blast System

The Rebuilding of the Quebec Bridge

More Powerful Express Locomotives

Progress in the Gas-Driven Ship Problem

Doubtful Cases of Radioactivity

Future Speed of Cruisers

The Morehouse Comet Observed

A Few Facts about Fakes

The Current Supplement

Reconstruction of the Baltimore & Ohio Bridge Over the Susquehanna River

The Collins System of Long-Distance Wireless Telephony

Public Service Car Fender and Wheel Guard Tests

IV.--The French Navy of To-Day

The “Flip-Flap”

By the English Correspondent of the Scientific American

Shaft Sinking by the Freezing Process

By Our English Correspondent.

Protecting Trains Under the East River

A Simple Package Tie

Ore Concentrator

An Improved Pipe Wrench

Patent Department

Shore Anchor

Attachment for Letter Boxes